817070491 has 2 divisors, whose sum is σ = 817070492. Its totient is φ = 817070490.

The previous prime is 817070489. The next prime is 817070543. The reversal of 817070491 is 194070718.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 817070491 - 2¹ = 817070489 is a prime.

Together with 817070489, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 817070491.

It is not a weakly prime, because it can be changed into another prime (817070461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 408535245 + 408535246.

It is an arithmetic number, because the mean of its divisors is an integer number (408535246).

Almost surely, 2^817070491 is an apocalyptic number.

817070491 is a deficient number, since it is larger than the sum of its proper divisors (1).

817070491 is an equidigital number, since it uses as much as digits as its factorization.

817070491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14112, while the sum is 37.

The square root of 817070491 is about 28584.4449132741. Note that the first 3 decimals coincide. The cubic root of 817070491 is about 934.8742015737.

The spelling of 817070491 in words is "eight hundred seventeen million, seventy thousand, four hundred ninety-one".