118251491 has 4 divisors (see below), whose sum is σ = 118446912. Its totient is φ = 118056072.

The previous prime is 118251479. The next prime is 118251493. The reversal of 118251491 is 194152811.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-118251491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (118251493) 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, 96800 + ... + 98013.

It is an arithmetic number, because the mean of its divisors is an integer number (29611728).

Almost surely, 2^118251491 is an apocalyptic number.

118251491 is a deficient number, since it is larger than the sum of its proper divisors (195421).

118251491 is an equidigital number, since it uses as much as digits as its factorization.

118251491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195420.

The product of its digits is 2880, while the sum is 32.

The square root of 118251491 is about 10874.3501415027. The cubic root of 118251491 is about 490.8350207498.

The spelling of 118251491 in words is "one hundred eighteen million, two hundred fifty-one thousand, four hundred ninety-one".