118431913 has 2 divisors, whose sum is σ = 118431914. Its totient is φ = 118431912.

The previous prime is 118431829. The next prime is 118431919. The reversal of 118431913 is 319134811.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 105124009 + 13307904 = 10253^2 + 3648^2 .

It is a cyclic number.

It is not a de Polignac number, because 118431913 - 2²¹ = 116334761 is a prime.

It is a super-2 number, since 2×118431913² = 28052236033679138, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (118431919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 59215956 + 59215957.

It is an arithmetic number, because the mean of its divisors is an integer number (59215957).

Almost surely, 2^118431913 is an apocalyptic number.

It is an amenable number.

118431913 is a deficient number, since it is larger than the sum of its proper divisors (1).

118431913 is an equidigital number, since it uses as much as digits as its factorization.

118431913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 31.

The square root of 118431913 is about 10882.6427397025. The cubic root of 118431913 is about 491.0845241168.

The spelling of 118431913 in words is "one hundred eighteen million, four hundred thirty-one thousand, nine hundred thirteen".