31223311400 has 24 divisors (see below), whose sum is σ = 72594199470. Its totient is φ = 12489324480.

The previous prime is 31223311387. The next prime is 31223311433. The reversal of 31223311400 is 411332213.

It can be written as a sum of positive squares in 3 ways, for example, as 16387584196 + 14835727204 = 128014^2 + 121802^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 78058079 + ... + 78058478.

Almost surely, 2^31223311400 is an apocalyptic number.

It is an amenable number.

31223311400 is an abundant number, since it is smaller than the sum of its proper divisors (41370888070).

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

31223311400 is a wasteful number, since it uses less digits than its factorization.

31223311400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156116573 (or 156116564 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 31223311400 its reverse (411332213), we get a palindrome (31634643613).

The spelling of 31223311400 in words is "thirty-one billion, two hundred twenty-three million, three hundred eleven thousand, four hundred".