131816291 has 4 divisors (see below), whose sum is σ = 131943000. Its totient is φ = 131689584.

The previous prime is 131816287. The next prime is 131816299. The reversal of 131816291 is 192618131.

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 131816291 - 2² = 131816287 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 8.

It is not an unprimeable number, because it can be changed into a prime (131816299) 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, 61781 + ... + 63878.

It is an arithmetic number, because the mean of its divisors is an integer number (32985750).

Almost surely, 2^131816291 is an apocalyptic number.

131816291 is a deficient number, since it is larger than the sum of its proper divisors (126709).

131816291 is a wasteful number, since it uses less digits than its factorization.

131816291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126708.

The product of its digits is 2592, while the sum is 32.

The square root of 131816291 is about 11481.1276014162. The cubic root of 131816291 is about 508.9280200514.

The spelling of 131816291 in words is "one hundred thirty-one million, eight hundred sixteen thousand, two hundred ninety-one".