131873665 has 24 divisors (see below), whose sum is σ = 198797760. Its totient is φ = 82204320.

The previous prime is 131873663. The next prime is 131873669. The reversal of 131873665 is 566378131.

It is a happy number.

It is not a de Polignac number, because 131873665 - 2¹ = 131873663 is a prime.

It is not an unprimeable number, because it can be changed into a prime (131873663) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11335 + ... + 19804.

It is an arithmetic number, because the mean of its divisors is an integer number (8283240).

Almost surely, 2^131873665 is an apocalyptic number.

It is an amenable number.

131873665 is a deficient number, since it is larger than the sum of its proper divisors (66924095).

131873665 is a wasteful number, since it uses less digits than its factorization.

131873665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31173 (or 31162 counting only the distinct ones).

The product of its digits is 90720, while the sum is 40.

The square root of 131873665 is about 11483.6259517628. The cubic root of 131873665 is about 509.0018475493.

The spelling of 131873665 in words is "one hundred thirty-one million, eight hundred seventy-three thousand, six hundred sixty-five".