816137213 has 2 divisors, whose sum is σ = 816137214. Its totient is φ = 816137212.

The previous prime is 816137159. The next prime is 816137233. The reversal of 816137213 is 312731618.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 767179204 + 48958009 = 27698^2 + 6997^2 .

It is a cyclic number.

It is not a de Polignac number, because 816137213 - 2⁶ = 816137149 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 816137213.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (816137233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 408068606 + 408068607.

It is an arithmetic number, because the mean of its divisors is an integer number (408068607).

Almost surely, 2^816137213 is an apocalyptic number.

It is an amenable number.

816137213 is a deficient number, since it is larger than the sum of its proper divisors (1).

816137213 is an equidigital number, since it uses as much as digits as its factorization.

816137213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 32.

The square root of 816137213 is about 28568.1153211058. The cubic root of 816137213 is about 934.5181205330.

The spelling of 816137213 in words is "eight hundred sixteen million, one hundred thirty-seven thousand, two hundred thirteen".