822115813 has 2 divisors, whose sum is σ = 822115814. Its totient is φ = 822115812.

The previous prime is 822115787. The next prime is 822115817. The reversal of 822115813 is 318511228.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 451052644 + 371063169 = 21238^2 + 19263^2 .

It is a cyclic number.

It is not a de Polignac number, because 822115813 - 2⁵ = 822115781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (822115817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 411057906 + 411057907.

It is an arithmetic number, because the mean of its divisors is an integer number (411057907).

Almost surely, 2^822115813 is an apocalyptic number.

It is an amenable number.

822115813 is a deficient number, since it is larger than the sum of its proper divisors (1).

822115813 is an equidigital number, since it uses as much as digits as its factorization.

822115813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3840, while the sum is 31.

The square root of 822115813 is about 28672.5620236490. The cubic root of 822115813 is about 936.7945034899.

The spelling of 822115813 in words is "eight hundred twenty-two million, one hundred fifteen thousand, eight hundred thirteen".