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8772121 = 71123551
BaseRepresentation
bin100001011101…
…101000011001
3121111200002101
4201131220121
54221201441
6512003401
7134363461
oct41355031
917450071
108772121
114a51696
122b30561
131a81a07
141244ba1
15b84231
hex85da19

8772121 has 4 divisors (see below), whose sum is σ = 8895744. Its totient is φ = 8648500.

The previous prime is 8772089. The next prime is 8772139. The reversal of 8772121 is 1212778.

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 8772121 - 25 = 8772089 is a prime.

It is a deceptive number, since it divides R8772120.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8772121.

It is not an unprimeable number, because it can be changed into a prime (8772161) 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 3 ways as a sum of consecutive naturals, for example, 61705 + ... + 61846.

It is an arithmetic number, because the mean of its divisors is an integer number (2223936).

Almost surely, 28772121 is an apocalyptic number.

It is an amenable number.

8772121 is a deficient number, since it is larger than the sum of its proper divisors (123623).

8772121 is a wasteful number, since it uses less digits than its factorization.

8772121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123622.

The product of its digits is 1568, while the sum is 28.

The square root of 8772121 is about 2961.7766627482. The cubic root of 8772121 is about 206.2377701962.

Adding to 8772121 its reverse (1212778), we get a palindrome (9984899).

The spelling of 8772121 in words is "eight million, seven hundred seventy-two thousand, one hundred twenty-one".

Divisors: 1 71 123551 8772121