117921997 has 8 divisors (see below), whose sum is σ = 121374432. Its totient is φ = 114483600.

The previous prime is 117921971. The next prime is 117922019. The reversal of 117921997 is 799129711.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 117921997 - 2¹⁵ = 117889229 is a prime.

It is a super-3 number, since 3×117921997³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (117921907) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14922 + ... + 21412.

It is an arithmetic number, because the mean of its divisors is an integer number (15171804).

Almost surely, 2^117921997 is an apocalyptic number.

It is an amenable number.

117921997 is a deficient number, since it is larger than the sum of its proper divisors (3452435).

117921997 is an equidigital number, since it uses as much as digits as its factorization.

117921997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7019.

The product of its digits is 71442, while the sum is 46.

The square root of 117921997 is about 10859.1895185598. The cubic root of 117921997 is about 490.3787118068.

The spelling of 117921997 in words is "one hundred seventeen million, nine hundred twenty-one thousand, nine hundred ninety-seven".