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80240281 = 117294571
BaseRepresentation
bin1001100100001…
…01111010011001
312120222121222021
410302011322121
5131020142111
611543454441
71663013452
oct462057231
9176877867
1080240281
1141325790
1222a57421
1313815874
14a92a129
15709ed71
hex4c85e99

80240281 has 4 divisors (see below), whose sum is σ = 87534864. Its totient is φ = 72945700.

The previous prime is 80240269. The next prime is 80240291. The reversal of 80240281 is 18204208.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 80240281 - 211 = 80238233 is a prime.

It is a super-2 number, since 2×802402812 = 12877005389917922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80240201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3647275 + ... + 3647296.

It is an arithmetic number, because the mean of its divisors is an integer number (21883716).

Almost surely, 280240281 is an apocalyptic number.

It is an amenable number.

80240281 is a deficient number, since it is larger than the sum of its proper divisors (7294583).

80240281 is a wasteful number, since it uses less digits than its factorization.

80240281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7294582.

The product of its (nonzero) digits is 1024, while the sum is 25.

The square root of 80240281 is about 8957.6939554776. The cubic root of 80240281 is about 431.3178982639.

Adding to 80240281 its reverse (18204208), we get a palindrome (98444489).

The spelling of 80240281 in words is "eighty million, two hundred forty thousand, two hundred eighty-one".

Divisors: 1 11 7294571 80240281