131565139 has 8 divisors (see below), whose sum is σ = 138601040. Its totient is φ = 124540416.

The previous prime is 131565131. The next prime is 131565143. The reversal of 131565139 is 931565131.

It is a happy number.

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 131565139 - 2³ = 131565131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131565131) 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, 33739 + ... + 37435.

It is an arithmetic number, because the mean of its divisors is an integer number (17325130).

Almost surely, 2^131565139 is an apocalyptic number.

131565139 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

131565139 is a deficient number, since it is larger than the sum of its proper divisors (7035901).

131565139 is a wasteful number, since it uses less digits than its factorization.

131565139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5589.

The product of its digits is 12150, while the sum is 34.

The square root of 131565139 is about 11470.1847849108. The cubic root of 131565139 is about 508.6045912518.

The spelling of 131565139 in words is "one hundred thirty-one million, five hundred sixty-five thousand, one hundred thirty-nine".