118211813 has 2 divisors, whose sum is σ = 118211814. Its totient is φ = 118211812.

The previous prime is 118211809. The next prime is 118211827. The reversal of 118211813 is 318112811.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 82773604 + 35438209 = 9098^2 + 5953^2 .

It is an emirp because it is prime and its reverse (318112811) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 118211813 - 2² = 118211809 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (118211803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 59105906 + 59105907.

It is an arithmetic number, because the mean of its divisors is an integer number (59105907).

Almost surely, 2^118211813 is an apocalyptic number.

It is an amenable number.

118211813 is a deficient number, since it is larger than the sum of its proper divisors (1).

118211813 is an equidigital number, since it uses as much as digits as its factorization.

118211813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 384, while the sum is 26.

The square root of 118211813 is about 10872.5256035569. The cubic root of 118211813 is about 490.7801164932.

The spelling of 118211813 in words is "one hundred eighteen million, two hundred eleven thousand, eight hundred thirteen".