31930985 has 4 divisors (see below), whose sum is σ = 38317188. Its totient is φ = 25544784.

The previous prime is 31930979. The next prime is 31931027. The reversal of 31930985 is 58903913.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17875984 + 14055001 = 4228^2 + 3749^2 .

It is a cyclic number.

It is not a de Polignac number, because 31930985 - 2⁸ = 31930729 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3193094 + ... + 3193103.

It is an arithmetic number, because the mean of its divisors is an integer number (9579297).

Almost surely, 2^31930985 is an apocalyptic number.

It is an amenable number.

31930985 is a deficient number, since it is larger than the sum of its proper divisors (6386203).

31930985 is an equidigital number, since it uses as much as digits as its factorization.

31930985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6386202.

The product of its (nonzero) digits is 29160, while the sum is 38.

The square root of 31930985 is about 5650.7508350661. The cubic root of 31930985 is about 317.2518076072.

The spelling of 31930985 in words is "thirty-one million, nine hundred thirty thousand, nine hundred eighty-five".