117990681 has 16 divisors (see below), whose sum is σ = 163450368. Its totient is φ = 75628800.

The previous prime is 117990679. The next prime is 117990683. The reversal of 117990681 is 186099711.

It is an interprime number because it is at equal distance from previous prime (117990679) and next prime (117990683).

It is not a de Polignac number, because 117990681 - 2¹ = 117990679 is a prime.

It is a super-2 number, since 2×117990681² = 27843601605687522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (117990683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10561 + ... + 18641.

It is an arithmetic number, because the mean of its divisors is an integer number (10215648).

Almost surely, 2^117990681 is an apocalyptic number.

It is an amenable number.

117990681 is a deficient number, since it is larger than the sum of its proper divisors (45459687).

117990681 is a wasteful number, since it uses less digits than its factorization.

117990681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8272.

The product of its (nonzero) digits is 27216, while the sum is 42.

The square root of 117990681 is about 10862.3515409878. The cubic root of 117990681 is about 490.4739008164.

The spelling of 117990681 in words is "one hundred seventeen million, nine hundred ninety thousand, six hundred eighty-one".