31971042 has 12 divisors (see below), whose sum is σ = 69270630. Its totient is φ = 10657008.

The previous prime is 31971001. The next prime is 31971047. The reversal of 31971042 is 24017913.

It can be written as a sum of positive squares in only one way, i.e., 24890121 + 7080921 = 4989^2 + 2661^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31970997 and 31971015.

It is not an unprimeable number, because it can be changed into a prime (31971047) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 888067 + ... + 888102.

Almost surely, 2^31971042 is an apocalyptic number.

31971042 is an abundant number, since it is smaller than the sum of its proper divisors (37299588).

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

31971042 is a wasteful number, since it uses less digits than its factorization.

31971042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1776177 (or 1776174 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 31971042 is about 5654.2941204009. The cubic root of 31971042 is about 317.3844149089.

Adding to 31971042 its reverse (24017913), we get a palindrome (55988955).

The spelling of 31971042 in words is "thirty-one million, nine hundred seventy-one thousand, forty-two".