810647340091 has 2 divisors, whose sum is σ = 810647340092. Its totient is φ = 810647340090.

The previous prime is 810647340071. The next prime is 810647340103. The reversal of 810647340091 is 190043746018.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 810647340091 - 2⁷ = 810647339963 is a prime.

It is a super-2 number, since 2×810647340091² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (810647340011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 405323670045 + 405323670046.

It is an arithmetic number, because the mean of its divisors is an integer number (405323670046).

Almost surely, 2^810647340091 is an apocalyptic number.

810647340091 is a deficient number, since it is larger than the sum of its proper divisors (1).

810647340091 is an equidigital number, since it uses as much as digits as its factorization.

810647340091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 43.

The spelling of 810647340091 in words is "eight hundred ten billion, six hundred forty-seven million, three hundred forty thousand, ninety-one".