816560971 has 2 divisors, whose sum is σ = 816560972. Its totient is φ = 816560970.

The previous prime is 816560897. The next prime is 816561001. The reversal of 816560971 is 179065618.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 816560971 - 2¹⁵ = 816528203 is a prime.

It is a super-3 number, since 3×816560971³ (a number of 28 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (816560071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 408280485 + 408280486.

It is an arithmetic number, because the mean of its divisors is an integer number (408280486).

Almost surely, 2^816560971 is an apocalyptic number.

816560971 is a deficient number, since it is larger than the sum of its proper divisors (1).

816560971 is an equidigital number, since it uses as much as digits as its factorization.

816560971 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90720, while the sum is 43.

The square root of 816560971 is about 28575.5309836930. The cubic root of 816560971 is about 934.6798339492.

The spelling of 816560971 in words is "eight hundred sixteen million, five hundred sixty thousand, nine hundred seventy-one".