131531431601 has 4 divisors (see below), whose sum is σ = 131603584512. Its totient is φ = 131459278692.

The previous prime is 131531431571. The next prime is 131531431637. The reversal of 131531431601 is 106134135131.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 131531431601 - 2³⁴ = 114351562417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131531431001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36073721 + ... + 36077366.

It is an arithmetic number, because the mean of its divisors is an integer number (32900896128).

Almost surely, 2^131531431601 is an apocalyptic number.

It is an amenable number.

131531431601 is a deficient number, since it is larger than the sum of its proper divisors (72152911).

131531431601 is an equidigital number, since it uses as much as digits as its factorization.

131531431601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72152910.

The product of its (nonzero) digits is 3240, while the sum is 29.

Adding to 131531431601 its reverse (106134135131), we get a palindrome (237665566732).

The spelling of 131531431601 in words is "one hundred thirty-one billion, five hundred thirty-one million, four hundred thirty-one thousand, six hundred one".