131505665 has 8 divisors (see below), whose sum is σ = 158184168. Its totient is φ = 104952960.

The previous prime is 131505641. The next prime is 131505757. The reversal of 131505665 is 566505131.

It can be written as a sum of positive squares in 4 ways, for example, as 82369 + 131423296 = 287^2 + 11464^2 .

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

It is not a de Polignac number, because 131505665 - 2¹⁰ = 131504641 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29132 + ... + 33341.

It is an arithmetic number, because the mean of its divisors is an integer number (19773021).

Almost surely, 2^131505665 is an apocalyptic number.

It is an amenable number.

131505665 is a deficient number, since it is larger than the sum of its proper divisors (26678503).

131505665 is an equidigital number, since it uses as much as digits as its factorization.

131505665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62899.

The product of its (nonzero) digits is 13500, while the sum is 32.

The square root of 131505665 is about 11467.5919442575. The cubic root of 131505665 is about 508.5279414928.

The spelling of 131505665 in words is "one hundred thirty-one million, five hundred five thousand, six hundred sixty-five".