131956909 has 8 divisors (see below), whose sum is σ = 153653760. Its totient is φ = 110971536.

The previous prime is 131956879. The next prime is 131956943. The reversal of 131956909 is 909659131.

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 131956909 - 2²¹ = 129859757 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 (131956949) 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, 177469 + ... + 178210.

It is an arithmetic number, because the mean of its divisors is an integer number (19206720).

Almost surely, 2^131956909 is an apocalyptic number.

It is an amenable number.

131956909 is a deficient number, since it is larger than the sum of its proper divisors (21696851).

131956909 is an equidigital number, since it uses as much as digits as its factorization.

131956909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355739.

The product of its (nonzero) digits is 65610, while the sum is 43.

The square root of 131956909 is about 11487.2498449368. The cubic root of 131956909 is about 509.1089258843.

The spelling of 131956909 in words is "one hundred thirty-one million, nine hundred fifty-six thousand, nine hundred nine".