131785857 has 12 divisors (see below), whose sum is σ = 217551360. Its totient is φ = 75306168.

The previous prime is 131785847. The next prime is 131785861. The reversal of 131785857 is 758587131.

It is not a de Polignac number, because 131785857 - 2²⁰ = 130737281 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (131785807) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1045857 + ... + 1045982.

It is an arithmetic number, because the mean of its divisors is an integer number (18129280).

Almost surely, 2^131785857 is an apocalyptic number.

It is an amenable number.

131785857 is a deficient number, since it is larger than the sum of its proper divisors (85765503).

131785857 is a wasteful number, since it uses less digits than its factorization.

131785857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2091852 (or 2091849 counting only the distinct ones).

The product of its digits is 235200, while the sum is 45.

The square root of 131785857 is about 11479.8021324411. The cubic root of 131785857 is about 508.8888496084. Note that the first 4 decimals are identical.

The spelling of 131785857 in words is "one hundred thirty-one million, seven hundred eighty-five thousand, eight hundred fifty-seven".