131775661 has 4 divisors (see below), whose sum is σ = 131877792. Its totient is φ = 131673532.

The previous prime is 131775643. The next prime is 131775691. The reversal of 131775661 is 166577131.

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 131775661 - 2¹⁵ = 131742893 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 131775661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131775641) 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, 49105 + ... + 51718.

It is an arithmetic number, because the mean of its divisors is an integer number (32969448).

Almost surely, 2^131775661 is an apocalyptic number.

It is an amenable number.

131775661 is a deficient number, since it is larger than the sum of its proper divisors (102131).

131775661 is a wasteful number, since it uses less digits than its factorization.

131775661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102130.

The product of its digits is 26460, while the sum is 37.

The square root of 131775661 is about 11479.3580395421. The cubic root of 131775661 is about 508.8757253763.

The spelling of 131775661 in words is "one hundred thirty-one million, seven hundred seventy-five thousand, six hundred sixty-one".