117651997 has 4 divisors (see below), whose sum is σ = 119871900. Its totient is φ = 115432096.

The previous prime is 117651977. The next prime is 117652021. The reversal of 117651997 is 799156711.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 799156711 = 59 ⋅13545029.

It can be written as a sum of positive squares in 2 ways, for example, as 40018276 + 77633721 = 6326^2 + 8811^2 .

It is a cyclic number.

It is not a de Polignac number, because 117651997 - 2¹¹ = 117649949 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 (117651907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1109872 + ... + 1109977.

It is an arithmetic number, because the mean of its divisors is an integer number (29967975).

Almost surely, 2^117651997 is an apocalyptic number.

It is an amenable number.

117651997 is a deficient number, since it is larger than the sum of its proper divisors (2219903).

117651997 is an equidigital number, since it uses as much as digits as its factorization.

117651997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2219902.

The product of its digits is 119070, while the sum is 46.

The square root of 117651997 is about 10846.7505272316. The cubic root of 117651997 is about 490.0041607310.

The spelling of 117651997 in words is "one hundred seventeen million, six hundred fifty-one thousand, nine hundred ninety-seven".