31220230312 has 64 divisors (see below), whose sum is σ = 64056258000. Its totient is φ = 14206402560.

The previous prime is 31220230309. The next prime is 31220230369. The reversal of 31220230312 is 21303202213.

It can be written as a sum of positive squares in 8 ways, for example, as 7549176996 + 23671053316 = 86886^2 + 153854^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 31220230312.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 605314 + ... + 654862.

Almost surely, 2^31220230312 is an apocalyptic number.

It is an amenable number.

31220230312 is an abundant number, since it is smaller than the sum of its proper divisors (32836027688).

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

31220230312 is a wasteful number, since it uses less digits than its factorization.

31220230312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49726 (or 49722 counting only the distinct ones).

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

Adding to 31220230312 its reverse (21303202213), we get a palindrome (52523432525).

The spelling of 31220230312 in words is "thirty-one billion, two hundred twenty million, two hundred thirty thousand, three hundred twelve".