117766391 has 4 divisors (see below), whose sum is σ = 120638784. Its totient is φ = 114894000.

The previous prime is 117766387. The next prime is 117766393. The reversal of 117766391 is 193667711.

It is a happy number.

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 117766391 - 2² = 117766387 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41), and also a Moran number because the ratio is a prime number: 2872351 = 117766391 / (1 + 1 + 7 + 7 + 6 + 6 + 3 + 9 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (117766393) 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, 1436135 + ... + 1436216.

It is an arithmetic number, because the mean of its divisors is an integer number (30159696).

Almost surely, 2^117766391 is an apocalyptic number.

117766391 is a deficient number, since it is larger than the sum of its proper divisors (2872393).

117766391 is an equidigital number, since it uses as much as digits as its factorization.

117766391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2872392.

The product of its digits is 47628, while the sum is 41.

The square root of 117766391 is about 10852.0224382370. The cubic root of 117766391 is about 490.1629209734.

The spelling of 117766391 in words is "one hundred seventeen million, seven hundred sixty-six thousand, three hundred ninety-one".