31220431112 has 32 divisors (see below), whose sum is σ = 63082174680. Its totient is φ = 14400076800.

The previous prime is 31220431009. The next prime is 31220431163. The reversal of 31220431112 is 21113402213.

It can be written as a sum of positive squares in 4 ways, for example, as 4948559716 + 26271871396 = 70346^2 + 162086^2 .

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, 64862 + ... + 258162.

Almost surely, 2^31220431112 is an apocalyptic number.

It is an amenable number.

31220431112 is an abundant number, since it is smaller than the sum of its proper divisors (31861743568).

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

31220431112 is a wasteful number, since it uses less digits than its factorization.

31220431112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194873 (or 194869 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 31220431112 its reverse (21113402213), we get a palindrome (52333833325).

The spelling of 31220431112 in words is "thirty-one billion, two hundred twenty million, four hundred thirty-one thousand, one hundred twelve".