131640465 has 32 divisors (see below), whose sum is σ = 232704000. Its totient is φ = 63011520.

The previous prime is 131640451. The next prime is 131640479. The reversal of 131640465 is 564046131.

It is an interprime number because it is at equal distance from previous prime (131640451) and next prime (131640479).

It is not a de Polignac number, because 131640465 - 2⁴ = 131640449 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7986 + ... + 18084.

It is an arithmetic number, because the mean of its divisors is an integer number (7272000).

Almost surely, 2^131640465 is an apocalyptic number.

131640465 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

131640465 is a deficient number, since it is larger than the sum of its proper divisors (101063535).

131640465 is a wasteful number, since it uses less digits than its factorization.

131640465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10197.

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 131640465 is about 11473.4678715722. The cubic root of 131640465 is about 508.7016378315.

Adding to 131640465 its reverse (564046131), we get a palindrome (695686596).

The spelling of 131640465 in words is "one hundred thirty-one million, six hundred forty thousand, four hundred sixty-five".