131220132331 has 16 divisors (see below), whose sum is σ = 137080631520. Its totient is φ = 125499628800.

The previous prime is 131220132319. The next prime is 131220132391. The reversal of 131220132331 is 133231022131.

It is a cyclic number.

It is not a de Polignac number, because 131220132331 - 2³⁵ = 96860393963 is a prime.

It is a super-2 number, since 2×131220132331² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131220132391) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 393135 + ... + 645751.

It is an arithmetic number, because the mean of its divisors is an integer number (8567539470).

Almost surely, 2^131220132331 is an apocalyptic number.

131220132331 is a deficient number, since it is larger than the sum of its proper divisors (5860499189).

131220132331 is a wasteful number, since it uses less digits than its factorization.

131220132331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252894.

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 131220132331 its reverse (133231022131), we get a palindrome (264451154462).

The spelling of 131220132331 in words is "one hundred thirty-one billion, two hundred twenty million, one hundred thirty-two thousand, three hundred thirty-one".