131587291 has 4 divisors (see below), whose sum is σ = 143549784. Its totient is φ = 119624800.

The previous prime is 131587283. The next prime is 131587303. The reversal of 131587291 is 192785131.

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 131587291 - 2³ = 131587283 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 131587291.

It is not an unprimeable number, because it can be changed into a prime (131587201) 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, 5981230 + ... + 5981251.

It is an arithmetic number, because the mean of its divisors is an integer number (35887446).

Almost surely, 2^131587291 is an apocalyptic number.

131587291 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

131587291 is a deficient number, since it is larger than the sum of its proper divisors (11962493).

131587291 is a wasteful number, since it uses less digits than its factorization.

131587291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11962492.

The product of its digits is 15120, while the sum is 37.

The square root of 131587291 is about 11471.1503782315. The cubic root of 131587291 is about 508.6331347214.

It can be divided in two parts, 13158 and 7291, that added together give a square (20449 = 143²).

The spelling of 131587291 in words is "one hundred thirty-one million, five hundred eighty-seven thousand, two hundred ninety-one".