131231020131 has 20 divisors (see below), whose sum is σ = 197977429584. Its totient is φ = 86621130000.

The previous prime is 131231020069. The next prime is 131231020157. The reversal of 131231020131 is 131020132131.

It is not a de Polignac number, because 131231020131 - 2⁷ = 131231020003 is a prime.

It is a super-2 number, since 2×131231020131² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (131231027131) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 8012295 + ... + 8028656.

Almost surely, 2^131231020131 is an apocalyptic number.

131231020131 is a deficient number, since it is larger than the sum of its proper divisors (66746409453).

131231020131 is a wasteful number, since it uses less digits than its factorization.

131231020131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16041064 (or 16041055 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 131231020131 its reverse (131020132131), we get a palindrome (262251152262).

The spelling of 131231020131 in words is "one hundred thirty-one billion, two hundred thirty-one million, twenty thousand, one hundred thirty-one".