118171813 has 2 divisors, whose sum is σ = 118171814. Its totient is φ = 118171812.

The previous prime is 118171759. The next prime is 118171817. The reversal of 118171813 is 318171811.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 114554209 + 3617604 = 10703^2 + 1902^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-118171813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (118171817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 59085906 + 59085907.

It is an arithmetic number, because the mean of its divisors is an integer number (59085907).

Almost surely, 2^118171813 is an apocalyptic number.

It is an amenable number.

118171813 is a deficient number, since it is larger than the sum of its proper divisors (1).

118171813 is an equidigital number, since it uses as much as digits as its factorization.

118171813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1344, while the sum is 31.

The square root of 118171813 is about 10870.6859489179. The cubic root of 118171813 is about 490.7247542334.

The spelling of 118171813 in words is "one hundred eighteen million, one hundred seventy-one thousand, eight hundred thirteen".