131215032661 has 8 divisors (see below), whose sum is σ = 139540264920. Its totient is φ = 122957211648.

The previous prime is 131215032607. The next prime is 131215032677. The reversal of 131215032661 is 166230512131.

It can be written as a sum of positive squares in 4 ways, for example, as 83120349636 + 48094683025 = 288306^2 + 219305^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 131215032661 - 2²⁵ = 131181478229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131215032461) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16848796 + ... + 16856581.

It is an arithmetic number, because the mean of its divisors is an integer number (17442533115).

Almost surely, 2^131215032661 is an apocalyptic number.

It is an amenable number.

131215032661 is a deficient number, since it is larger than the sum of its proper divisors (8325232259).

131215032661 is a wasteful number, since it uses less digits than its factorization.

131215032661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33705623.

The product of its (nonzero) digits is 6480, while the sum is 31.

Adding to 131215032661 its reverse (166230512131), we get a palindrome (297445544792).

The spelling of 131215032661 in words is "one hundred thirty-one billion, two hundred fifteen million, thirty-two thousand, six hundred sixty-one".