118256581 has 2 divisors, whose sum is σ = 118256582. Its totient is φ = 118256580.

The previous prime is 118256561. The next prime is 118256603. The reversal of 118256581 is 185652811.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 109202500 + 9054081 = 10450^2 + 3009^2 .

It is a cyclic number.

It is not a de Polignac number, because 118256581 - 2⁹ = 118256069 is a prime.

It is a super-2 number, since 2×118256581² = 27969237899619122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 118256581.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (118256521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 59128290 + 59128291.

It is an arithmetic number, because the mean of its divisors is an integer number (59128291).

Almost surely, 2^118256581 is an apocalyptic number.

It is an amenable number.

118256581 is a deficient number, since it is larger than the sum of its proper divisors (1).

118256581 is an equidigital number, since it uses as much as digits as its factorization.

118256581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19200, while the sum is 37.

The square root of 118256581 is about 10874.5841759582. The cubic root of 118256581 is about 490.8420631259.

The spelling of 118256581 in words is "one hundred eighteen million, two hundred fifty-six thousand, five hundred eighty-one".