118137221 has 2 divisors, whose sum is σ = 118137222. Its totient is φ = 118137220.

The previous prime is 118137209. The next prime is 118137251. The reversal of 118137221 is 122731811.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 104550625 + 13586596 = 10225^2 + 3686^2 .

It is a cyclic number.

It is not a de Polignac number, because 118137221 - 2¹⁴ = 118120837 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (118137251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 59068610 + 59068611.

It is an arithmetic number, because the mean of its divisors is an integer number (59068611).

Almost surely, 2^118137221 is an apocalyptic number.

It is an amenable number.

118137221 is a deficient number, since it is larger than the sum of its proper divisors (1).

118137221 is an equidigital number, since it uses as much as digits as its factorization.

118137221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 672, while the sum is 26.

The square root of 118137221 is about 10869.0947645147. The cubic root of 118137221 is about 490.6768668766.

The spelling of 118137221 in words is "one hundred eighteen million, one hundred thirty-seven thousand, two hundred twenty-one".