31971330 has 48 divisors (see below), whose sum is σ = 85380984. Its totient is φ = 8294400.

The previous prime is 31971307. The next prime is 31971341. The reversal of 31971330 is 3317913.

It can be written as a sum of positive squares in 4 ways, for example, as 31708161 + 263169 = 5631^2 + 513^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31971294 and 31971303.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1471 + ... + 8130.

Almost surely, 2^31971330 is an apocalyptic number.

31971330 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

31971330 is an abundant number, since it is smaller than the sum of its proper divisors (53409654).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31971330 is a wasteful number, since it uses less digits than its factorization.

31971330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9651 (or 9648 counting only the distinct ones).

The product of its (nonzero) digits is 1701, while the sum is 27.

The square root of 31971330 is about 5654.3195877135. The cubic root of 31971330 is about 317.3853679217.

The spelling of 31971330 in words is "thirty-one million, nine hundred seventy-one thousand, three hundred thirty".