118791997 has 4 divisors (see below), whose sum is σ = 118900800. Its totient is φ = 118683196.

The previous prime is 118791991. The next prime is 118792019. The reversal of 118791997 is 799197811.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 799197811 = 113 ⋅7072547.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-118791997 is a prime.

It is a super-2 number, since 2×118791997² = 28223077102496018, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (118791991) 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, 52747 + ... + 54952.

It is an arithmetic number, because the mean of its divisors is an integer number (29725200).

Almost surely, 2^118791997 is an apocalyptic number.

It is an amenable number.

118791997 is a deficient number, since it is larger than the sum of its proper divisors (108803).

118791997 is a wasteful number, since it uses less digits than its factorization.

118791997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108802.

The product of its digits is 285768, while the sum is 52.

The square root of 118791997 is about 10899.1741430257. The cubic root of 118791997 is about 491.5817233446.

The spelling of 118791997 in words is "one hundred eighteen million, seven hundred ninety-one thousand, nine hundred ninety-seven".