31223131472 has 40 divisors (see below), whose sum is σ = 66737265000. Its totient is φ = 14059192320.

The previous prime is 31223131463. The next prime is 31223131501. The reversal of 31223131472 is 27413132213.

It can be written as a sum of positive squares in 4 ways, for example, as 2369352976 + 28853778496 = 48676^2 + 169864^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1822097 + ... + 1839152.

It is an arithmetic number, because the mean of its divisors is an integer number (1668431625).

Almost surely, 2^31223131472 is an apocalyptic number.

It is an amenable number.

31223131472 is an abundant number, since it is smaller than the sum of its proper divisors (35514133528).

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

31223131472 is a wasteful number, since it uses less digits than its factorization.

31223131472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3661311 (or 3661305 counting only the distinct ones).

The product of its digits is 6048, while the sum is 29.

Adding to 31223131472 its reverse (27413132213), we get a palindrome (58636263685).

The spelling of 31223131472 in words is "thirty-one billion, two hundred twenty-three million, one hundred thirty-one thousand, four hundred seventy-two".