117511681 has 16 divisors (see below), whose sum is σ = 137491200. Its totient is φ = 98354880.

The previous prime is 117511679. The next prime is 117511687. The reversal of 117511681 is 186115711.

It is a cyclic number.

It is not a de Polignac number, because 117511681 - 2¹ = 117511679 is a prime.

It is a super-2 number, since 2×117511681² = 27617990342891522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (117511687) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62700 + ... + 64546.

It is an arithmetic number, because the mean of its divisors is an integer number (8593200).

Almost surely, 2^117511681 is an apocalyptic number.

It is an amenable number.

117511681 is a deficient number, since it is larger than the sum of its proper divisors (19979519).

117511681 is a wasteful number, since it uses less digits than its factorization.

117511681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2064.

The product of its digits is 1680, while the sum is 31.

The square root of 117511681 is about 10840.2804853011. The cubic root of 117511681 is about 489.8092843807.

The spelling of 117511681 in words is "one hundred seventeen million, five hundred eleven thousand, six hundred eighty-one".