118091681 has 2 divisors, whose sum is σ = 118091682. Its totient is φ = 118091680.

The previous prime is 118091651. The next prime is 118091713. The reversal of 118091681 is 186190811.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 88661056 + 29430625 = 9416^2 + 5425^2 .

It is a cyclic number.

It is not a de Polignac number, because 118091681 - 2¹⁴ = 118075297 is a prime.

It is a super-2 number, since 2×118091681² = 27891290242811522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (118091621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 59045840 + 59045841.

It is an arithmetic number, because the mean of its divisors is an integer number (59045841).

Almost surely, 2^118091681 is an apocalyptic number.

It is an amenable number.

118091681 is a deficient number, since it is larger than the sum of its proper divisors (1).

118091681 is an equidigital number, since it uses as much as digits as its factorization.

118091681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 35.

The square root of 118091681 is about 10866.9996319131. Note that the first 3 decimals coincide. The cubic root of 118091681 is about 490.6138094247.

The spelling of 118091681 in words is "one hundred eighteen million, ninety-one thousand, six hundred eighty-one".