131245665 has 16 divisors (see below), whose sum is σ = 211958208. Its totient is φ = 69342656.

The previous prime is 131245657. The next prime is 131245669. The reversal of 131245665 is 566542131.

It is a cyclic number.

It is not a de Polignac number, because 131245665 - 2³ = 131245657 is a prime.

It is not an unprimeable number, because it can be changed into a prime (131245669) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39282 + ... + 42491.

It is an arithmetic number, because the mean of its divisors is an integer number (13247388).

Almost surely, 2^131245665 is an apocalyptic number.

131245665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

131245665 is a deficient number, since it is larger than the sum of its proper divisors (80712543).

131245665 is a wasteful number, since it uses less digits than its factorization.

131245665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81888.

The product of its digits is 21600, while the sum is 33.

The square root of 131245665 is about 11456.2500409165. The cubic root of 131245665 is about 508.1925833259.

Adding to 131245665 its reverse (566542131), we get a palindrome (697787796).

The spelling of 131245665 in words is "one hundred thirty-one million, two hundred forty-five thousand, six hundred sixty-five".