131175661 has 4 divisors (see below), whose sum is σ = 131961312. Its totient is φ = 130390012.

The previous prime is 131175659. The next prime is 131175673. The reversal of 131175661 is 166571131.

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 131175661 - 2¹ = 131175659 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 (131175691) 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, 392575 + ... + 392908.

It is an arithmetic number, because the mean of its divisors is an integer number (32990328).

Almost surely, 2^131175661 is an apocalyptic number.

It is an amenable number.

131175661 is a deficient number, since it is larger than the sum of its proper divisors (785651).

131175661 is an equidigital number, since it uses as much as digits as its factorization.

131175661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 785650.

The product of its digits is 3780, while the sum is 31.

The square root of 131175661 is about 11453.1943579073. The cubic root of 131175661 is about 508.1022137618.

The spelling of 131175661 in words is "one hundred thirty-one million, one hundred seventy-five thousand, six hundred sixty-one".