31312942 has 4 divisors (see below), whose sum is σ = 46969416. Its totient is φ = 15656470.

The previous prime is 31312937. The next prime is 31312949. The reversal of 31312942 is 24921313.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24921313 = 37 ⋅673549.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31312949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7828234 + ... + 7828237.

It is an arithmetic number, because the mean of its divisors is an integer number (11742354).

Almost surely, 2^31312942 is an apocalyptic number.

31312942 is a deficient number, since it is larger than the sum of its proper divisors (15656474).

31312942 is a wasteful number, since it uses less digits than its factorization.

31312942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15656473.

The product of its digits is 1296, while the sum is 25.

The square root of 31312942 is about 5595.7968154678. The cubic root of 31312942 is about 315.1915925227.

The spelling of 31312942 in words is "thirty-one million, three hundred twelve thousand, nine hundred forty-two".