117420991 has 4 divisors (see below), whose sum is σ = 117442800. Its totient is φ = 117399184.

The previous prime is 117420977. The next prime is 117421009. The reversal of 117420991 is 199024711.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 117420991 - 2⁵ = 117420959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (117420091) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3630 + ... + 15748.

It is an arithmetic number, because the mean of its divisors is an integer number (29360700).

Almost surely, 2^117420991 is an apocalyptic number.

117420991 is a deficient number, since it is larger than the sum of its proper divisors (21809).

117420991 is an equidigital number, since it uses as much as digits as its factorization.

117420991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21808.

The product of its (nonzero) digits is 4536, while the sum is 34.

The square root of 117420991 is about 10836.0966680812. The cubic root of 117420991 is about 489.6832480133.

The spelling of 117420991 in words is "one hundred seventeen million, four hundred twenty thousand, nine hundred ninety-one".