131534705261 has 4 divisors (see below), whose sum is σ = 131839890624. Its totient is φ = 131229519900.

The previous prime is 131534705257. The next prime is 131534705287. The reversal of 131534705261 is 162507435131.

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, and also an emirpimes, since its reverse is a distinct semiprime: 162507435131 = 5113 ⋅31783187.

It is a cyclic number.

It is not a de Polignac number, because 131534705261 - 2² = 131534705257 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 (131534705201) 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, 152592035 + ... + 152592896.

It is an arithmetic number, because the mean of its divisors is an integer number (32959972656).

Almost surely, 2^131534705261 is an apocalyptic number.

It is an amenable number.

131534705261 is a deficient number, since it is larger than the sum of its proper divisors (305185363).

131534705261 is an equidigital number, since it uses as much as digits as its factorization.

131534705261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305185362.

The product of its (nonzero) digits is 75600, while the sum is 38.

The spelling of 131534705261 in words is "one hundred thirty-one billion, five hundred thirty-four million, seven hundred five thousand, two hundred sixty-one".