131301561 has 4 divisors (see below), whose sum is σ = 175068752. Its totient is φ = 87534372.

The previous prime is 131301551. The next prime is 131301587. The reversal of 131301561 is 165103131.

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 not a de Polignac number, because 131301561 - 2¹¹ = 131299513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131301551) 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, 21883591 + ... + 21883596.

It is an arithmetic number, because the mean of its divisors is an integer number (43767188).

Almost surely, 2^131301561 is an apocalyptic number.

It is an amenable number.

131301561 is a deficient number, since it is larger than the sum of its proper divisors (43767191).

131301561 is an equidigital number, since it uses as much as digits as its factorization.

131301561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43767190.

The product of its (nonzero) digits is 270, while the sum is 21.

The square root of 131301561 is about 11458.6893229549. The cubic root of 131301561 is about 508.2647175205.

Adding to 131301561 its reverse (165103131), we get a palindrome (296404692).

The spelling of 131301561 in words is "one hundred thirty-one million, three hundred one thousand, five hundred sixty-one".