118551809 has 2 divisors, whose sum is σ = 118551810. Its totient is φ = 118551808.

The previous prime is 118551793. The next prime is 118551841. The reversal of 118551809 is 908155811.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 94148209 + 24403600 = 9703^2 + 4940^2 .

It is an emirp because it is prime and its reverse (908155811) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 118551809 - 2⁴ = 118551793 is a prime.

It is not a weakly prime, because it can be changed into another prime (118551859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 59275904 + 59275905.

It is an arithmetic number, because the mean of its divisors is an integer number (59275905).

Almost surely, 2^118551809 is an apocalyptic number.

It is an amenable number.

118551809 is a deficient number, since it is larger than the sum of its proper divisors (1).

118551809 is an equidigital number, since it uses as much as digits as its factorization.

118551809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14400, while the sum is 38.

The square root of 118551809 is about 10888.1499346767. The cubic root of 118551809 is about 491.2501867067.

The spelling of 118551809 in words is "one hundred eighteen million, five hundred fifty-one thousand, eight hundred nine".