118581839 has 2 divisors, whose sum is σ = 118581840. Its totient is φ = 118581838.

The previous prime is 118581833. The next prime is 118581871. The reversal of 118581839 is 938185811.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 118581839 - 2²⁰ = 117533263 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 118581839.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (118581833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 59290919 + 59290920.

It is an arithmetic number, because the mean of its divisors is an integer number (59290920).

Almost surely, 2^118581839 is an apocalyptic number.

118581839 is a deficient number, since it is larger than the sum of its proper divisors (1).

118581839 is an equidigital number, since it uses as much as digits as its factorization.

118581839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69120, while the sum is 44.

The square root of 118581839 is about 10889.5288695150. The cubic root of 118581839 is about 491.2916622376.

The spelling of 118581839 in words is "one hundred eighteen million, five hundred eighty-one thousand, eight hundred thirty-nine".