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80120401 = 89512
BaseRepresentation
bin1001100011010…
…00101001010001
312120202112112021
410301220221101
5131002323101
611541131441
71662004114
oct461505121
9176675467
1080120401
1141253709
12229b9b81
13137a312a
14a8d857b
1570795a1
hex4c68a51

80120401 has 3 divisors (see below), whose sum is σ = 80129353. Its totient is φ = 80111450.

The previous prime is 80120393. The next prime is 80120419. The reversal of 80120401 is 10402108.

It is a happy number.

The square root of 80120401 is 8951.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 80120401 - 23 = 80120393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80120441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 4476 + ... + 13426.

Almost surely, 280120401 is an apocalyptic number.

80120401 is the 8951-st square number.

80120401 is the 4476-th centered octagonal number.

It is an amenable number.

80120401 is a deficient number, since it is larger than the sum of its proper divisors (8952).

80120401 is an frugal number, since it uses more digits than its factorization.

80120401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17902 (or 8951 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

The cubic root of 80120401 is about 431.1029930633.

Multiplying 80120401 by its sum of digits (16), we get a square (1281926416 = 358042).

Multiplying 80120401 by its product of nonzero digits (64), we get a square (5127705664 = 716082).

Adding to 80120401 its reverse (10402108), we get a palindrome (90522509).

The spelling of 80120401 in words is "eighty million, one hundred twenty thousand, four hundred one".

Divisors: 1 8951 80120401