131559391 has 8 divisors (see below), whose sum is σ = 134072064. Its totient is φ = 129063000.

The previous prime is 131559377. The next prime is 131559433. The reversal of 131559391 is 193955131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 131559391 - 2¹⁹ = 131035103 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 131559391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131559301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12906 + ... + 20728.

It is an arithmetic number, because the mean of its divisors is an integer number (16759008).

Almost surely, 2^131559391 is an apocalyptic number.

131559391 is a deficient number, since it is larger than the sum of its proper divisors (2512673).

131559391 is an equidigital number, since it uses as much as digits as its factorization.

131559391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8141.

The product of its digits is 18225, while the sum is 37.

The square root of 131559391 is about 11469.9342195149. The cubic root of 131559391 is about 508.5971842700.

It can be divided in two parts, 1315 and 59391, that added together give a palindrome (60706).

The spelling of 131559391 in words is "one hundred thirty-one million, five hundred fifty-nine thousand, three hundred ninety-one".