118557217 has 2 divisors, whose sum is σ = 118557218. Its totient is φ = 118557216.

The previous prime is 118557209. The next prime is 118557233. The reversal of 118557217 is 712755811.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 117483921 + 1073296 = 10839^2 + 1036^2 .

It is an emirp because it is prime and its reverse (712755811) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 118557217 - 2³ = 118557209 is a prime.

It is not a weakly prime, because it can be changed into another prime (118557247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 59278608 + 59278609.

It is an arithmetic number, because the mean of its divisors is an integer number (59278609).

Almost surely, 2^118557217 is an apocalyptic number.

It is an amenable number.

118557217 is a deficient number, since it is larger than the sum of its proper divisors (1).

118557217 is an equidigital number, since it uses as much as digits as its factorization.

118557217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19600, while the sum is 37.

The square root of 118557217 is about 10888.3982752285. The cubic root of 118557217 is about 491.2576564102.

The spelling of 118557217 in words is "one hundred eighteen million, five hundred fifty-seven thousand, two hundred seventeen".