31223220232 has 8 divisors (see below), whose sum is σ = 58543537950. Its totient is φ = 15611610112.

The previous prime is 31223220227. The next prime is 31223220233. The reversal of 31223220232 is 23202232213.

It can be written as a sum of positive squares in only one way, i.e., 30812185156 + 411035076 = 175534^2 + 20274^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (31223220233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1951451257 + ... + 1951451272.

Almost surely, 2^31223220232 is an apocalyptic number.

It is an amenable number.

31223220232 is a deficient number, since it is larger than the sum of its proper divisors (27320317718).

31223220232 is a wasteful number, since it uses less digits than its factorization.

31223220232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3902902535 (or 3902902531 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 22.

Adding to 31223220232 its reverse (23202232213), we get a palindrome (54425452445).

The spelling of 31223220232 in words is "thirty-one billion, two hundred twenty-three million, two hundred twenty thousand, two hundred thirty-two".