117992891 has 2 divisors, whose sum is σ = 117992892. Its totient is φ = 117992890.

The previous prime is 117992887. The next prime is 117992911. The reversal of 117992891 is 198299711.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 117992891 - 2² = 117992887 is a prime.

It is not a weakly prime, because it can be changed into another prime (117992821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58996445 + 58996446.

It is an arithmetic number, because the mean of its divisors is an integer number (58996446).

Almost surely, 2^117992891 is an apocalyptic number.

117992891 is a deficient number, since it is larger than the sum of its proper divisors (1).

117992891 is an equidigital number, since it uses as much as digits as its factorization.

117992891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81648, while the sum is 47.

The square root of 117992891 is about 10862.4532680238. The cubic root of 117992891 is about 490.4769630372.

The spelling of 117992891 in words is "one hundred seventeen million, nine hundred ninety-two thousand, eight hundred ninety-one".