131864287 has 4 divisors (see below), whose sum is σ = 133169976. Its totient is φ = 130558600.

The previous prime is 131864279. The next prime is 131864309. The reversal of 131864287 is 782468131.

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

It is a cyclic number.

It is not a de Polignac number, because 131864287 - 2³ = 131864279 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131864687) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 652693 + ... + 652894.

It is an arithmetic number, because the mean of its divisors is an integer number (33292494).

Almost surely, 2^131864287 is an apocalyptic number.

131864287 is a deficient number, since it is larger than the sum of its proper divisors (1305689).

131864287 is a wasteful number, since it uses less digits than its factorization.

131864287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1305688.

The product of its digits is 64512, while the sum is 40.

The square root of 131864287 is about 11483.2176239937. The cubic root of 131864287 is about 508.9897816263.

The spelling of 131864287 in words is "one hundred thirty-one million, eight hundred sixty-four thousand, two hundred eighty-seven".