118178681 has 2 divisors, whose sum is σ = 118178682. Its totient is φ = 118178680.

The previous prime is 118178659. The next prime is 118178693. The reversal of 118178681 is 186871811.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 117397225 + 781456 = 10835^2 + 884^2 .

It is a cyclic number.

It is not a de Polignac number, because 118178681 - 2⁶ = 118178617 is a prime.

It is a super-2 number, since 2×118178681² = 27932401285799522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (118171681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 59089340 + 59089341.

It is an arithmetic number, because the mean of its divisors is an integer number (59089341).

Almost surely, 2^118178681 is an apocalyptic number.

It is an amenable number.

118178681 is a deficient number, since it is larger than the sum of its proper divisors (1).

118178681 is an equidigital number, since it uses as much as digits as its factorization.

118178681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21504, while the sum is 41.

The square root of 118178681 is about 10871.0018397570. The cubic root of 118178681 is about 490.7342608217.

The spelling of 118178681 in words is "one hundred eighteen million, one hundred seventy-eight thousand, six hundred eighty-one".