31331242 has 16 divisors (see below), whose sum is σ = 48412800. Its totient is φ = 15200640.

The previous prime is 31331239. The next prime is 31331243. The reversal of 31331242 is 24213313.

It is a super-3 number, since 3×31331242³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (31331243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7642 + ... + 11002.

It is an arithmetic number, because the mean of its divisors is an integer number (3025800).

Almost surely, 2^31331242 is an apocalyptic number.

31331242 is a deficient number, since it is larger than the sum of its proper divisors (17081558).

31331242 is a wasteful number, since it uses less digits than its factorization.

31331242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3501.

The product of its digits is 432, while the sum is 19.

The square root of 31331242 is about 5597.4317325002. The cubic root of 31331242 is about 315.2529822920.

Adding to 31331242 its reverse (24213313), we get a palindrome (55544555).

The spelling of 31331242 in words is "thirty-one million, three hundred thirty-one thousand, two hundred forty-two".