131905237 has 2 divisors, whose sum is σ = 131905238. Its totient is φ = 131905236.

The previous prime is 131905231. The next prime is 131905247. The reversal of 131905237 is 732509131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 82919236 + 48986001 = 9106^2 + 6999^2 .

It is a cyclic number.

It is not a de Polignac number, because 131905237 - 2³ = 131905229 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 131905199 and 131905208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131905231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65952618 + 65952619.

It is an arithmetic number, because the mean of its divisors is an integer number (65952619).

Almost surely, 2^131905237 is an apocalyptic number.

It is an amenable number.

131905237 is a deficient number, since it is larger than the sum of its proper divisors (1).

131905237 is an equidigital number, since it uses as much as digits as its factorization.

131905237 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5670, while the sum is 31.

The square root of 131905237 is about 11485.0005224205. Note that the first 3 decimals coincide. The cubic root of 131905237 is about 509.0424645142.

The spelling of 131905237 in words is "one hundred thirty-one million, nine hundred five thousand, two hundred thirty-seven".