31201320100 has 18 divisors (see below), whose sum is σ = 67706864834. Its totient is φ = 12480528000.

The previous prime is 31201320089. The next prime is 31201320113. The reversal of 31201320100 is 102310213.

It can be written as a sum of positive squares in 3 ways, for example, as 58247424 + 31143072676 = 7632^2 + 176474^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 156006501 + ... + 156006700.

Almost surely, 2^31201320100 is an apocalyptic number.

It is an amenable number.

31201320100 is an abundant number, since it is smaller than the sum of its proper divisors (36505544734).

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

31201320100 is a wasteful number, since it uses less digits than its factorization.

31201320100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312013215 (or 312013208 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 13.

Adding to 31201320100 its reverse (102310213), we get a palindrome (31303630313).

The spelling of 31201320100 in words is "thirty-one billion, two hundred one million, three hundred twenty thousand, one hundred".