118457221 has 2 divisors, whose sum is σ = 118457222. Its totient is φ = 118457220.

The previous prime is 118457219. The next prime is 118457237. The reversal of 118457221 is 122754811.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 114254721 + 4202500 = 10689^2 + 2050^2 .

It is a cyclic number.

It is not a de Polignac number, because 118457221 - 2¹ = 118457219 is a prime.

It is a super-2 number, since 2×118457221² = 28064226414085682, which contains 22 as substring.

Together with 118457219, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (118457201) 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, 59228610 + 59228611.

It is an arithmetic number, because the mean of its divisors is an integer number (59228611).

Almost surely, 2^118457221 is an apocalyptic number.

It is an amenable number.

118457221 is a deficient number, since it is larger than the sum of its proper divisors (1).

118457221 is an equidigital number, since it uses as much as digits as its factorization.

118457221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4480, while the sum is 31.

The square root of 118457221 is about 10883.8054466257. The cubic root of 118457221 is about 491.1195019693.

The spelling of 118457221 in words is "one hundred eighteen million, four hundred fifty-seven thousand, two hundred twenty-one".