118516621 has 2 divisors, whose sum is σ = 118516622. Its totient is φ = 118516620.

The previous prime is 118516603. The next prime is 118516633. The reversal of 118516621 is 126615811.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73102500 + 45414121 = 8550^2 + 6739^2 .

It is a cyclic number.

It is not a de Polignac number, because 118516621 - 2¹⁵ = 118483853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (118516121) 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 as a sum of consecutive naturals, namely, 59258310 + 59258311.

It is an arithmetic number, because the mean of its divisors is an integer number (59258311).

Almost surely, 2^118516621 is an apocalyptic number.

It is an amenable number.

118516621 is a deficient number, since it is larger than the sum of its proper divisors (1).

118516621 is an equidigital number, since it uses as much as digits as its factorization.

118516621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2880, while the sum is 31.

The square root of 118516621 is about 10886.5339295848. The cubic root of 118516621 is about 491.2015783605.

The spelling of 118516621 in words is "one hundred eighteen million, five hundred sixteen thousand, six hundred twenty-one".