31931042 has 32 divisors (see below), whose sum is σ = 56899584. Its totient is φ = 13248000.

The previous prime is 31931041. The next prime is 31931051. The reversal of 31931042 is 24013913.

It is a junction number, because it is equal to n+sod(n) for n = 31930999 and 31931017.

It is not an unprimeable number, because it can be changed into a prime (31931041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27167 + ... + 28317.

It is an arithmetic number, because the mean of its divisors is an integer number (1778112).

Almost surely, 2^31931042 is an apocalyptic number.

31931042 is a deficient number, since it is larger than the sum of its proper divisors (24968542).

31931042 is a wasteful number, since it uses less digits than its factorization.

31931042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1274.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 31931042 is about 5650.7558786414. The cubic root of 31931042 is about 317.2519963824.

Adding to 31931042 its reverse (24013913), we get a palindrome (55944955).

The spelling of 31931042 in words is "thirty-one million, nine hundred thirty-one thousand, forty-two".