131885437 has 2 divisors, whose sum is σ = 131885438. Its totient is φ = 131885436.

The previous prime is 131885387. The next prime is 131885443. The reversal of 131885437 is 734588131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 123899161 + 7986276 = 11131^2 + 2826^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131885437 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 131885437.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131888437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65942718 + 65942719.

It is an arithmetic number, because the mean of its divisors is an integer number (65942719).

Almost surely, 2^131885437 is an apocalyptic number.

It is an amenable number.

131885437 is a deficient number, since it is larger than the sum of its proper divisors (1).

131885437 is an equidigital number, since it uses as much as digits as its factorization.

131885437 is an evil number, because the sum of its binary digits is even.

The product of its digits is 80640, while the sum is 40.

The square root of 131885437 is about 11484.1384962042. The cubic root of 131885437 is about 509.0169928312.

The spelling of 131885437 in words is "one hundred thirty-one million, eight hundred eighty-five thousand, four hundred thirty-seven".