31201020100 has 18 divisors (see below), whose sum is σ = 67706213834. Its totient is φ = 12480408000.

The previous prime is 31201020079. The next prime is 31201020143. The reversal of 31201020100 is 102010213.

It can be written as a sum of positive squares in 3 ways, for example, as 6011521156 + 25189498944 = 77534^2 + 158712^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 156005001 + ... + 156005200.

Almost surely, 2^31201020100 is an apocalyptic number.

It is an amenable number.

31201020100 is an abundant number, since it is smaller than the sum of its proper divisors (36505193734).

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

31201020100 is a wasteful number, since it uses less digits than its factorization.

31201020100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312010215 (or 312010208 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 10.

Adding to 31201020100 its reverse (102010213), we get a palindrome (31303030313).

The spelling of 31201020100 in words is "thirty-one billion, two hundred one million, twenty thousand, one hundred".