131505887 has 2 divisors, whose sum is σ = 131505888. Its totient is φ = 131505886.

The previous prime is 131505883. The next prime is 131505919. The reversal of 131505887 is 788505131.

It is a weak prime.

It is an emirp because it is prime and its reverse (788505131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 131505887 - 2² = 131505883 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 131505887.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131505883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65752943 + 65752944.

It is an arithmetic number, because the mean of its divisors is an integer number (65752944).

Almost surely, 2^131505887 is an apocalyptic number.

131505887 is a deficient number, since it is larger than the sum of its proper divisors (1).

131505887 is an equidigital number, since it uses as much as digits as its factorization.

131505887 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 33600, while the sum is 38.

The square root of 131505887 is about 11467.6016237049. The cubic root of 131505887 is about 508.5282276481.

The spelling of 131505887 in words is "one hundred thirty-one million, five hundred five thousand, eight hundred eighty-seven".