131857945 has 4 divisors (see below), whose sum is σ = 158229540. Its totient is φ = 105486352.

The previous prime is 131857939. The next prime is 131857961. The reversal of 131857945 is 549758131.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 104284944 + 27573001 = 10212^2 + 5251^2 .

It is a cyclic number.

It is not a de Polignac number, because 131857945 - 2³ = 131857937 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13185790 + ... + 13185799.

It is an arithmetic number, because the mean of its divisors is an integer number (39557385).

Almost surely, 2^131857945 is an apocalyptic number.

It is an amenable number.

131857945 is a deficient number, since it is larger than the sum of its proper divisors (26371595).

131857945 is an equidigital number, since it uses as much as digits as its factorization.

131857945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26371594.

The product of its digits is 151200, while the sum is 43.

The square root of 131857945 is about 11482.9414785585. The cubic root of 131857945 is about 508.9816215575.

The spelling of 131857945 in words is "one hundred thirty-one million, eight hundred fifty-seven thousand, nine hundred forty-five".