102864721 has 2 divisors, whose sum is σ = 102864722. Its totient is φ = 102864720.

The previous prime is 102864703. The next prime is 102864731. The reversal of 102864721 is 127468201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57153600 + 45711121 = 7560^2 + 6761^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102864721 is a prime.

It is not a weakly prime, because it can be changed into another prime (102864701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51432360 + 51432361.

It is an arithmetic number, because the mean of its divisors is an integer number (51432361).

Almost surely, 2^102864721 is an apocalyptic number.

It is an amenable number.

102864721 is a deficient number, since it is larger than the sum of its proper divisors (1).

102864721 is an equidigital number, since it uses as much as digits as its factorization.

102864721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 102864721 is about 10142.2246573422. The cubic root of 102864721 is about 468.5495058182.

The spelling of 102864721 in words is "one hundred two million, eight hundred sixty-four thousand, seven hundred twenty-one".