813033421 has 2 divisors, whose sum is σ = 813033422. Its totient is φ = 813033420.

The previous prime is 813033359. The next prime is 813033439. The reversal of 813033421 is 124330318.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 784784196 + 28249225 = 28014^2 + 5315^2 .

It is a cyclic number.

It is not a de Polignac number, because 813033421 - 2²⁷ = 678815693 is a prime.

It is a super-2 number, since 2×813033421² = 1322046687325926482, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (813033451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 406516710 + 406516711.

It is an arithmetic number, because the mean of its divisors is an integer number (406516711).

Almost surely, 2^813033421 is an apocalyptic number.

It is an amenable number.

813033421 is a deficient number, since it is larger than the sum of its proper divisors (1).

813033421 is an equidigital number, since it uses as much as digits as its factorization.

813033421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 813033421 is about 28513.7409155656. The cubic root of 813033421 is about 933.3319496436.

Adding to 813033421 its reverse (124330318), we get a palindrome (937363739).

The spelling of 813033421 in words is "eight hundred thirteen million, thirty-three thousand, four hundred twenty-one".