12171501117 has 6 divisors (see below), whose sum is σ = 17581057182. Its totient is φ = 8114334072.

The previous prime is 12171501113. The next prime is 12171501119. The reversal of 12171501117 is 71110517121.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 11756197476 + 415303641 = 108426^2 + 20379^2 .

It is not a de Polignac number, because 12171501117 - 2² = 12171501113 is a prime.

It is a super-2 number, since 2×12171501117² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12171501113) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 676194498 + ... + 676194515.

It is an arithmetic number, because the mean of its divisors is an integer number (2930176197).

Almost surely, 2^12171501117 is an apocalyptic number.

It is an amenable number.

12171501117 is a deficient number, since it is larger than the sum of its proper divisors (5409556065).

12171501117 is a wasteful number, since it uses less digits than its factorization.

12171501117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1352389019 (or 1352389016 counting only the distinct ones).

The product of its (nonzero) digits is 490, while the sum is 27.

The spelling of 12171501117 in words is "twelve billion, one hundred seventy-one million, five hundred one thousand, one hundred seventeen".