131311020133 has 4 divisors (see below), whose sum is σ = 131347367788. Its totient is φ = 131274672480.

The previous prime is 131311020091. The next prime is 131311020143. The reversal of 131311020133 is 331020113131.

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 3044611684 + 128266408449 = 55178^2 + 358143^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131311020133 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 131311020133.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131311020143) 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, 18168408 + ... + 18175633.

It is an arithmetic number, because the mean of its divisors is an integer number (32836841947).

Almost surely, 2^131311020133 is an apocalyptic number.

It is an amenable number.

131311020133 is a deficient number, since it is larger than the sum of its proper divisors (36347655).

131311020133 is an equidigital number, since it uses as much as digits as its factorization.

131311020133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36347654.

The product of its (nonzero) digits is 162, while the sum is 19.

Adding to 131311020133 its reverse (331020113131), we get a palindrome (462331133264).

The spelling of 131311020133 in words is "one hundred thirty-one billion, three hundred eleven million, twenty thousand, one hundred thirty-three".