131597161 has 4 divisors (see below), whose sum is σ = 132012612. Its totient is φ = 131181712.

The previous prime is 131597149. The next prime is 131597171. The reversal of 131597161 is 161795131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 161795131 = 109 ⋅1484359.

It can be written as a sum of positive squares in 2 ways, for example, as 12110400 + 119486761 = 3480^2 + 10931^2 .

It is a cyclic number.

It is not a de Polignac number, because 131597161 - 2⁵ = 131597129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131597111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 207250 + ... + 207883.

It is an arithmetic number, because the mean of its divisors is an integer number (33003153).

Almost surely, 2^131597161 is an apocalyptic number.

It is an amenable number.

131597161 is a deficient number, since it is larger than the sum of its proper divisors (415451).

131597161 is an equidigital number, since it uses as much as digits as its factorization.

131597161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 415450.

The product of its digits is 5670, while the sum is 34.

The square root of 131597161 is about 11471.5805798504. The cubic root of 131597161 is about 508.6458514599.

The spelling of 131597161 in words is "one hundred thirty-one million, five hundred ninety-seven thousand, one hundred sixty-one".