117721897 has 8 divisors (see below), whose sum is σ = 118901952. Its totient is φ = 116547600.

The previous prime is 117721861. The next prime is 117721909. The reversal of 117721897 is 798127711.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-117721897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (117721837) 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 7 ways as a sum of consecutive naturals, for example, 47622 + ... + 50032.

It is an arithmetic number, because the mean of its divisors is an integer number (14862744).

Almost surely, 2^117721897 is an apocalyptic number.

It is an amenable number.

117721897 is a deficient number, since it is larger than the sum of its proper divisors (1180055).

117721897 is a wasteful number, since it uses less digits than its factorization.

117721897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2879.

The product of its digits is 49392, while the sum is 43.

The square root of 117721897 is about 10849.9722119460. The cubic root of 117721897 is about 490.1011827699.

The spelling of 117721897 in words is "one hundred seventeen million, seven hundred twenty-one thousand, eight hundred ninety-seven".