118978681 has 2 divisors, whose sum is σ = 118978682. Its totient is φ = 118978680.

The previous prime is 118978669. The next prime is 118978687. The reversal of 118978681 is 186879811.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73874025 + 45104656 = 8595^2 + 6716^2 .

It is a cyclic number.

It is not a de Polignac number, because 118978681 - 2²⁵ = 85424249 is a prime.

It is a super-2 number, since 2×118978681² = 28311853064999522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (118978687) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 59489340 + 59489341.

It is an arithmetic number, because the mean of its divisors is an integer number (59489341).

Almost surely, 2^118978681 is an apocalyptic number.

It is an amenable number.

118978681 is a deficient number, since it is larger than the sum of its proper divisors (1).

118978681 is an equidigital number, since it uses as much as digits as its factorization.

118978681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 193536, while the sum is 49.

The square root of 118978681 is about 10907.7349161043. The cubic root of 118978681 is about 491.8390987393.

The spelling of 118978681 in words is "one hundred eighteen million, nine hundred seventy-eight thousand, six hundred eighty-one".