131856417 has 88 divisors (see below), whose sum is σ = 255090240. Its totient is φ = 66134880.

The previous prime is 131856397. The next prime is 131856427. The reversal of 131856417 is 714658131.

131856417 is a `hidden beast` number, since 1 + 3 + 1 + 8 + 5 + 641 + 7 = 666.

It is not a de Polignac number, because 131856417 - 2¹¹ = 131854369 is a prime.

It is a super-2 number, since 2×131856417² = 34772229408155778, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (131856427) by changing a digit.

It is a polite number, since it can be written in 87 ways as a sum of consecutive naturals, for example, 4546759 + ... + 4546787.

Almost surely, 2^131856417 is an apocalyptic number.

It is an amenable number.

131856417 is a deficient number, since it is larger than the sum of its proper divisors (123233823).

131856417 is an frugal number, since it uses more digits than its factorization.

131856417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77 (or 50 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 131856417 is about 11482.8749448908. The cubic root of 131856417 is about 508.9796554848.

The spelling of 131856417 in words is "one hundred thirty-one million, eight hundred fifty-six thousand, four hundred seventeen".