31212253243431 has 96 divisors (see below), whose sum is σ = 49332281910912. Its totient is φ = 18901533772800.

The previous prime is 31212253243417. The next prime is 31212253243459. The reversal of 31212253243431 is 13434235221213.

31212253243431 is a `hidden beast` number, since 3 + 1 + 21 + 22 + 532 + 43 + 43 + 1 = 666.

It is not a de Polignac number, because 31212253243431 - 2⁵ = 31212253243399 is a prime.

It is a super-2 number, since 2×31212253243431² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31212253243331) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2474603481 + ... + 2474616093.

It is an arithmetic number, because the mean of its divisors is an integer number (513877936572).

Almost surely, 2^{31212253243431} is an apocalyptic number.

31212253243431 is a deficient number, since it is larger than the sum of its proper divisors (18120028667481).

31212253243431 is a wasteful number, since it uses less digits than its factorization.

31212253243431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13993 (or 13990 counting only the distinct ones).

The product of its digits is 103680, while the sum is 36.

Adding to 31212253243431 its reverse (13434235221213), we get a palindrome (44646488464644).

The spelling of 31212253243431 in words is "thirty-one trillion, two hundred twelve billion, two hundred fifty-three million, two hundred forty-three thousand, four hundred thirty-one".