118518649 has 2 divisors, whose sum is σ = 118518650. Its totient is φ = 118518648.

The previous prime is 118518607. The next prime is 118518671. The reversal of 118518649 is 946815811.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87516025 + 31002624 = 9355^2 + 5568^2 .

It is an emirp because it is prime and its reverse (946815811) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 118518649 - 2²¹ = 116421497 is a prime.

It is not a weakly prime, because it can be changed into another prime (118518689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 59259324 + 59259325.

It is an arithmetic number, because the mean of its divisors is an integer number (59259325).

Almost surely, 2^118518649 is an apocalyptic number.

It is an amenable number.

118518649 is a deficient number, since it is larger than the sum of its proper divisors (1).

118518649 is an equidigital number, since it uses as much as digits as its factorization.

118518649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69120, while the sum is 43.

The square root of 118518649 is about 10886.6270717794. The cubic root of 118518649 is about 491.2043800804.

The spelling of 118518649 in words is "one hundred eighteen million, five hundred eighteen thousand, six hundred forty-nine".