131256161 has 8 divisors (see below), whose sum is σ = 138300000. Its totient is φ = 124225920.

The previous prime is 131256127. The next prime is 131256163. The reversal of 131256161 is 161652131.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131256161 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 131256161.

It is not an unprimeable number, because it can be changed into a prime (131256163) 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, 20966 + ... + 26496.

It is an arithmetic number, because the mean of its divisors is an integer number (17287500).

Almost surely, 2^131256161 is an apocalyptic number.

It is an amenable number.

131256161 is a deficient number, since it is larger than the sum of its proper divisors (7043839).

131256161 is a wasteful number, since it uses less digits than its factorization.

131256161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6799.

The product of its digits is 1080, while the sum is 26.

The square root of 131256161 is about 11456.7081223186. The cubic root of 131256161 is about 508.2061300518.

The spelling of 131256161 in words is "one hundred thirty-one million, two hundred fifty-six thousand, one hundred sixty-one".