118415681 has 2 divisors, whose sum is σ = 118415682. Its totient is φ = 118415680.

The previous prime is 118415677. The next prime is 118415741. The reversal of 118415681 is 186514811.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 117072400 + 1343281 = 10820^2 + 1159^2 .

It is a cyclic number.

It is not a de Polignac number, because 118415681 - 2² = 118415677 is a prime.

It is a super-2 number, since 2×118415681² = 28044547013387522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (118415611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 59207840 + 59207841.

It is an arithmetic number, because the mean of its divisors is an integer number (59207841).

Almost surely, 2^118415681 is an apocalyptic number.

It is an amenable number.

118415681 is a deficient number, since it is larger than the sum of its proper divisors (1).

118415681 is an equidigital number, since it uses as much as digits as its factorization.

118415681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7680, while the sum is 35.

The square root of 118415681 is about 10881.8969394127. The cubic root of 118415681 is about 491.0620874610.

The spelling of 118415681 in words is "one hundred eighteen million, four hundred fifteen thousand, six hundred eighty-one".