117921971 has 2 divisors, whose sum is σ = 117921972. Its totient is φ = 117921970.

The previous prime is 117921959. The next prime is 117922019. The reversal of 117921971 is 179129711.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 117921971 - 2⁶ = 117921907 is a prime.

It is not a weakly prime, because it can be changed into another prime (117926971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58960985 + 58960986.

It is an arithmetic number, because the mean of its divisors is an integer number (58960986).

Almost surely, 2^117921971 is an apocalyptic number.

117921971 is a deficient number, since it is larger than the sum of its proper divisors (1).

117921971 is an equidigital number, since it uses as much as digits as its factorization.

117921971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7938, while the sum is 38.

The square root of 117921971 is about 10859.1883214170. The cubic root of 117921971 is about 490.3786757664.

The spelling of 117921971 in words is "one hundred seventeen million, nine hundred twenty-one thousand, nine hundred seventy-one".