425931921 has 6 divisors (see below), whose sum is σ = 615235010. Its totient is φ = 283954608.

The previous prime is 425931887. The next prime is 425931937. The reversal of 425931921 is 129139524.

425931921 is a `hidden beast` number, since 42 + 593 + 1 + 9 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 411643521 + 14288400 = 20289^2 + 3780^2 .

It is not a de Polignac number, because 425931921 - 2¹⁴ = 425915537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (425932921) 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 5 ways as a sum of consecutive naturals, for example, 23662876 + ... + 23662893.

Almost surely, 2^425931921 is an apocalyptic number.

It is an amenable number.

425931921 is a deficient number, since it is larger than the sum of its proper divisors (189303089).

425931921 is a wasteful number, since it uses less digits than its factorization.

425931921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47325775 (or 47325772 counting only the distinct ones).

The product of its digits is 19440, while the sum is 36.

The square root of 425931921 is about 20638.1181554908. The cubic root of 425931921 is about 752.3964359706.

The spelling of 425931921 in words is "four hundred twenty-five million, nine hundred thirty-one thousand, nine hundred twenty-one".