131640645 has 32 divisors (see below), whose sum is σ = 223372800. Its totient is φ = 66014784.

The previous prime is 131640643. The next prime is 131640667. The reversal of 131640645 is 546046131.

It is not a de Polignac number, because 131640645 - 2¹ = 131640643 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131640643) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 37954 + ... + 41276.

It is an arithmetic number, because the mean of its divisors is an integer number (6980400).

Almost surely, 2^131640645 is an apocalyptic number.

131640645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

131640645 is a deficient number, since it is larger than the sum of its proper divisors (91732155).

131640645 is a wasteful number, since it uses less digits than its factorization.

131640645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3489.

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

The square root of 131640645 is about 11473.4757157541. The cubic root of 131640645 is about 508.7018696909.

Adding to 131640645 its reverse (546046131), we get a palindrome (677686776).

The spelling of 131640645 in words is "one hundred thirty-one million, six hundred forty thousand, six hundred forty-five".