813733421 has 2 divisors, whose sum is σ = 813733422. Its totient is φ = 813733420.

The previous prime is 813733397. The next prime is 813733439. The reversal of 813733421 is 124337318.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 502387396 + 311346025 = 22414^2 + 17645^2 .

It is a cyclic number.

It is not a de Polignac number, because 813733421 - 2²² = 809539117 is a prime.

It is a Chen prime.

It is equal to p_41816048 and since 813733421 and 41816048 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (813733471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 406866710 + 406866711.

It is an arithmetic number, because the mean of its divisors is an integer number (406866711).

Almost surely, 2^813733421 is an apocalyptic number.

It is an amenable number.

813733421 is a deficient number, since it is larger than the sum of its proper divisors (1).

813733421 is an equidigital number, since it uses as much as digits as its factorization.

813733421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 32.

The square root of 813733421 is about 28526.0130582596. The cubic root of 813733421 is about 933.5997307446.

The spelling of 813733421 in words is "eight hundred thirteen million, seven hundred thirty-three thousand, four hundred twenty-one".