6931999171161 has 15 divisors (see below), whose sum is σ = 10355244035983. Its totient is φ = 4621316983560.

The previous prime is 6931999171081. The next prime is 6931999171169. The reversal of 6931999171161 is 1611719991396.

The square root of 6931999171161 is 2632869.

It is a perfect power (a square), and thus also a powerful number.

6931999171161 is a `hidden beast` number, since 6 + 9 + 319 + 9 + 91 + 71 + 161 = 666.

It can be written as a sum of positive squares in only one way, i.e., 2852487922761 + 4079511248400 = 1688931^2 + 2019780^2 .

It is not a de Polignac number, because 6931999171161 - 2³⁷ = 6794560217689 is a prime.

It is a super-2 number, since 2×6931999171161² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6931999171169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 23549551 + ... + 23842091.

Almost surely, 2^{6931999171161} is an apocalyptic number.

6931999171161 is the 2632869-th square number.

6931999171161 is the 1316435-th centered octagonal number.

It is an amenable number.

6931999171161 is a deficient number, since it is larger than the sum of its proper divisors (3423244864822).

6931999171161 is an frugal number, since it uses more digits than its factorization.

6931999171161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 585094 (or 292544 counting only the distinct ones).

The product of its digits is 4960116, while the sum is 63.

The spelling of 6931999171161 in words is "six trillion, nine hundred thirty-one billion, nine hundred ninety-nine million, one hundred seventy-one thousand, one hundred sixty-one".