11818813 has 2 divisors, whose sum is σ = 11818814. Its totient is φ = 11818812.

The previous prime is 11818801. The next prime is 11818819. The reversal of 11818813 is 31881811.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9375844 + 2442969 = 3062^2 + 1563^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11818813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11818819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5909406 + 5909407.

It is an arithmetic number, because the mean of its divisors is an integer number (5909407).

Almost surely, 2^11818813 is an apocalyptic number.

It is an amenable number.

11818813 is a deficient number, since it is larger than the sum of its proper divisors (1).

11818813 is an equidigital number, since it uses as much as digits as its factorization.

11818813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1536, while the sum is 31.

The square root of 11818813 is about 3437.8500549035. The cubic root of 11818813 is about 227.7847370646.

The spelling of 11818813 in words is "eleven million, eight hundred eighteen thousand, eight hundred thirteen".