118918921 has 6 divisors (see below), whose sum is σ = 130712666. Its totient is φ = 108108000.

The previous prime is 118918913. The next prime is 118918931. The reversal of 118918921 is 129819811.

It can be written as a sum of positive squares in only one way, i.e., 109432521 + 9486400 = 10461^2 + 3080^2 .

It is not a de Polignac number, because 118918921 - 2³ = 118918913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (118918931) 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 5 ways as a sum of consecutive naturals, for example, 491280 + ... + 491521.

Almost surely, 2^118918921 is an apocalyptic number.

118918921 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

118918921 is a deficient number, since it is larger than the sum of its proper divisors (11793745).

118918921 is an equidigital number, since it uses as much as digits as its factorization.

118918921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 982823 (or 982812 counting only the distinct ones).

The product of its digits is 10368, while the sum is 40.

The square root of 118918921 is about 10904.9952315441. The cubic root of 118918921 is about 491.7567388110.

The spelling of 118918921 in words is "one hundred eighteen million, nine hundred eighteen thousand, nine hundred twenty-one".