118649891 has 4 divisors (see below), whose sum is σ = 119159352. Its totient is φ = 118140432.

The previous prime is 118649873. The next prime is 118649897. The reversal of 118649891 is 198946811.

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 118649891 - 2¹⁸ = 118387747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (118649897) 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, 254381 + ... + 254846.

It is an arithmetic number, because the mean of its divisors is an integer number (29789838).

Almost surely, 2^118649891 is an apocalyptic number.

118649891 is a deficient number, since it is larger than the sum of its proper divisors (509461).

118649891 is an equidigital number, since it uses as much as digits as its factorization.

118649891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 509460.

The product of its digits is 124416, while the sum is 47.

The square root of 118649891 is about 10892.6530744351. The cubic root of 118649891 is about 491.3856254361.

The spelling of 118649891 in words is "one hundred eighteen million, six hundred forty-nine thousand, eight hundred ninety-one".