31925861 has 4 divisors (see below), whose sum is σ = 34828224. Its totient is φ = 29023500.

The previous prime is 31925849. The next prime is 31925869. The reversal of 31925861 is 16852913.

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 not a de Polignac number, because 31925861 - 2¹⁸ = 31663717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31925869) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1451165 + ... + 1451186.

It is an arithmetic number, because the mean of its divisors is an integer number (8707056).

Almost surely, 2^31925861 is an apocalyptic number.

It is an amenable number.

31925861 is a deficient number, since it is larger than the sum of its proper divisors (2902363).

31925861 is a wasteful number, since it uses less digits than its factorization.

31925861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2902362.

The product of its digits is 12960, while the sum is 35.

The square root of 31925861 is about 5650.2974257998. The cubic root of 31925861 is about 317.2348367848.

The spelling of 31925861 in words is "thirty-one million, nine hundred twenty-five thousand, eight hundred sixty-one".