117881999 has 2 divisors, whose sum is σ = 117882000. Its totient is φ = 117881998.

The previous prime is 117881989. The next prime is 117882031. The reversal of 117881999 is 999188711.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 117881999 - 2¹⁶ = 117816463 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 117881999.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (117881989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58940999 + 58941000.

It is an arithmetic number, because the mean of its divisors is an integer number (58941000).

Almost surely, 2^117881999 is an apocalyptic number.

117881999 is a deficient number, since it is larger than the sum of its proper divisors (1).

117881999 is an equidigital number, since it uses as much as digits as its factorization.

117881999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 326592, while the sum is 53.

The square root of 117881999 is about 10857.3476963759. The cubic root of 117881999 is about 490.3232616327.

The spelling of 117881999 in words is "one hundred seventeen million, eight hundred eighty-one thousand, nine hundred ninety-nine".