118209649 has 2 divisors, whose sum is σ = 118209650. Its totient is φ = 118209648.

The previous prime is 118209563. The next prime is 118209671. The reversal of 118209649 is 946902811.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 91872225 + 26337424 = 9585^2 + 5132^2 .

It is an emirp because it is prime and its reverse (946902811) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 118209649 - 2⁹ = 118209137 is a prime.

It is a super-2 number, since 2×118209649² = 27947042233406402, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (118209149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 59104824 + 59104825.

It is an arithmetic number, because the mean of its divisors is an integer number (59104825).

Almost surely, 2^118209649 is an apocalyptic number.

It is an amenable number.

118209649 is a deficient number, since it is larger than the sum of its proper divisors (1).

118209649 is an equidigital number, since it uses as much as digits as its factorization.

118209649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 118209649 is about 10872.4260862054. The cubic root of 118209649 is about 490.7771217145. Note that the first 3 decimals are identical.

The spelling of 118209649 in words is "one hundred eighteen million, two hundred nine thousand, six hundred forty-nine".