925856721 has 6 divisors (see below), whose sum is σ = 1337348610. Its totient is φ = 617237808.

The previous prime is 925856677. The next prime is 925856731. The reversal of 925856721 is 127658529.

925856721 is a `hidden beast` number, since 9 + 2 + 585 + 67 + 2 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 906672321 + 19184400 = 30111^2 + 4380^2 .

It is not a de Polignac number, because 925856721 - 2⁷ = 925856593 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (925856731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 51436476 + ... + 51436493.

It is an arithmetic number, because the mean of its divisors is an integer number (222891435).

Almost surely, 2^925856721 is an apocalyptic number.

It is an amenable number.

925856721 is a deficient number, since it is larger than the sum of its proper divisors (411491889).

925856721 is a wasteful number, since it uses less digits than its factorization.

925856721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102872975 (or 102872972 counting only the distinct ones).

The product of its digits is 302400, while the sum is 45.

The square root of 925856721 is about 30427.8937982898. The cubic root of 925856721 is about 974.6482960276.

The spelling of 925856721 in words is "nine hundred twenty-five million, eight hundred fifty-six thousand, seven hundred twenty-one".