131509765 has 8 divisors (see below), whose sum is σ = 159713568. Its totient is φ = 103939920.

The previous prime is 131509757. The next prime is 131509769. The reversal of 131509765 is 567905131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 131509765 - 2³ = 131509757 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 (131509769) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 158031 + ... + 158860.

It is an arithmetic number, because the mean of its divisors is an integer number (19964196).

Almost surely, 2^131509765 is an apocalyptic number.

It is an amenable number.

131509765 is a deficient number, since it is larger than the sum of its proper divisors (28203803).

131509765 is an equidigital number, since it uses as much as digits as its factorization.

131509765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316979.

The product of its (nonzero) digits is 28350, while the sum is 37.

The square root of 131509765 is about 11467.7707075089. The cubic root of 131509765 is about 508.5332262915.

The spelling of 131509765 in words is "one hundred thirty-one million, five hundred nine thousand, seven hundred sixty-five".