31271985 has 24 divisors (see below), whose sum is σ = 54371304. Its totient is φ = 16627200.

The previous prime is 31271969. The next prime is 31272001. The reversal of 31271985 is 58917213.

It is an interprime number because it is at equal distance from previous prime (31271969) and next prime (31272001).

It can be written as a sum of positive squares in 4 ways, for example, as 11048976 + 20223009 = 3324^2 + 4497^2 .

It is not a de Polignac number, because 31271985 - 2⁴ = 31271969 is a prime.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 17179 + ... + 18911.

It is an arithmetic number, because the mean of its divisors is an integer number (2265471).

Almost surely, 2^31271985 is an apocalyptic number.

It is an amenable number.

31271985 is a deficient number, since it is larger than the sum of its proper divisors (23099319).

31271985 is a wasteful number, since it uses less digits than its factorization.

31271985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2145 (or 2142 counting only the distinct ones).

The product of its digits is 15120, while the sum is 36.

The square root of 31271985 is about 5592.1359962004. The cubic root of 31271985 is about 315.0541101301.

The spelling of 31271985 in words is "thirty-one million, two hundred seventy-one thousand, nine hundred eighty-five".