31203210113 has 4 divisors (see below), whose sum is σ = 31205578500. Its totient is φ = 31200841728.

The previous prime is 31203210109. The next prime is 31203210151. The reversal of 31203210113 is 31101230213.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15904488769 + 15298721344 = 126113^2 + 123688^2 .

It is a cyclic number.

It is not a de Polignac number, because 31203210113 - 2² = 31203210109 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31203210091 and 31203210100.

It is not an unprimeable number, because it can be changed into a prime (31203270113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1164320 + ... + 1190817.

It is an arithmetic number, because the mean of its divisors is an integer number (7801394625).

Almost surely, 2^31203210113 is an apocalyptic number.

It is an amenable number.

31203210113 is a deficient number, since it is larger than the sum of its proper divisors (2368387).

31203210113 is a wasteful number, since it uses less digits than its factorization.

31203210113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2368386.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 31203210113 its reverse (31101230213), we get a palindrome (62304440326).

The spelling of 31203210113 in words is "thirty-one billion, two hundred three million, two hundred ten thousand, one hundred thirteen".