2156641317 has 6 divisors (see below), whose sum is σ = 3115148582. Its totient is φ = 1437760872.

The previous prime is 2156641313. The next prime is 2156641327. The reversal of 2156641317 is 7131466512.

2156641317 is a `hidden beast` number, since 2 + 1 + 5 + 6 + 641 + 3 + 1 + 7 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1484483841 + 672157476 = 38529^2 + 25926^2 .

It is not a de Polignac number, because 2156641317 - 2² = 2156641313 is a prime.

It is a super-2 number, since 2×2156641317² = 9302203540382988978, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2156641313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 119813398 + ... + 119813415.

Almost surely, 2^2156641317 is an apocalyptic number.

It is an amenable number.

2156641317 is a deficient number, since it is larger than the sum of its proper divisors (958507265).

2156641317 is a wasteful number, since it uses less digits than its factorization.

2156641317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239626819 (or 239626816 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 2156641317 is about 46439.6524211799. The cubic root of 2156641317 is about 1291.9904605957.

The spelling of 2156641317 in words is "two billion, one hundred fifty-six million, six hundred forty-one thousand, three hundred seventeen".