118163491 has 4 divisors (see below), whose sum is σ = 118590352. Its totient is φ = 117736632.

The previous prime is 118163471. The next prime is 118163501. The reversal of 118163491 is 194361811.

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 118163491 - 2¹¹ = 118161443 is a prime.

It is a super-2 number, since 2×118163491² = 27925221210614162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (118163401) 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, 213015 + ... + 213568.

It is an arithmetic number, because the mean of its divisors is an integer number (29647588).

Almost surely, 2^118163491 is an apocalyptic number.

118163491 is a deficient number, since it is larger than the sum of its proper divisors (426861).

118163491 is an equidigital number, since it uses as much as digits as its factorization.

118163491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 426860.

The product of its digits is 5184, while the sum is 34.

The square root of 118163491 is about 10870.3031696453. The cubic root of 118163491 is about 490.7132345453.

The spelling of 118163491 in words is "one hundred eighteen million, one hundred sixty-three thousand, four hundred ninety-one".