812065091 has 2 divisors, whose sum is σ = 812065092. Its totient is φ = 812065090.

The previous prime is 812065039. The next prime is 812065141. The reversal of 812065091 is 190560218.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 812065091 - 2¹⁰ = 812064067 is a prime.

It is not a weakly prime, because it can be changed into another prime (812065021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 406032545 + 406032546.

It is an arithmetic number, because the mean of its divisors is an integer number (406032546).

Almost surely, 2^812065091 is an apocalyptic number.

812065091 is a deficient number, since it is larger than the sum of its proper divisors (1).

812065091 is an equidigital number, since it uses as much as digits as its factorization.

812065091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 32.

The square root of 812065091 is about 28496.7557978097. The cubic root of 812065091 is about 932.9612669051.

The spelling of 812065091 in words is "eight hundred twelve million, sixty-five thousand, ninety-one".