117985997 has 4 divisors (see below), whose sum is σ = 118067040. Its totient is φ = 117904956.

The previous prime is 117985993. The next prime is 117986039. The reversal of 117985997 is 799589711.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 117985997 - 2² = 117985993 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (117985993) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38297 + ... + 41262.

It is an arithmetic number, because the mean of its divisors is an integer number (29516760).

Almost surely, 2^117985997 is an apocalyptic number.

It is an amenable number.

117985997 is a deficient number, since it is larger than the sum of its proper divisors (81043).

117985997 is an equidigital number, since it uses as much as digits as its factorization.

117985997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81042.

The product of its digits is 1428840, while the sum is 56.

The square root of 117985997 is about 10862.1359317585. The cubic root of 117985997 is about 490.4674104446.

The spelling of 117985997 in words is "one hundred seventeen million, nine hundred eighty-five thousand, nine hundred ninety-seven".