813091 has 2 divisors, whose sum is σ = 813092. Its totient is φ = 813090.

The previous prime is 813089. The next prime is 813097. The reversal of 813091 is 190318.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 813091 - 2¹ = 813089 is a prime.

It is a super-2 number, since 2×813091² = 1322233948562, which contains 22 as substring.

Together with 813089, it forms a pair of twin primes.

813091 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (813097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 406545 + 406546.

It is an arithmetic number, because the mean of its divisors is an integer number (406546).

2⁸¹³⁰⁹¹ is an apocalyptic number.

813091 is a deficient number, since it is larger than the sum of its proper divisors (1).

813091 is an equidigital number, since it uses as much as digits as its factorization.

813091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 22.

The square root of 813091 is about 901.7155870894. The cubic root of 813091 is about 93.3353981969.

The spelling of 813091 in words is "eight hundred thirteen thousand, ninety-one".