999964597 has 2 divisors, whose sum is σ = 999964598. Its totient is φ = 999964596.

The previous prime is 999964579. The next prime is 999964649. The reversal of 999964597 is 795469999.

Together with previous prime (999964579) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 978813796 + 21150801 = 31286^2 + 4599^2 .

It is an emirp because it is prime and its reverse (795469999) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999964597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999964397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499982298 + 499982299.

It is an arithmetic number, because the mean of its divisors is an integer number (499982299).

Almost surely, 2^999964597 is an apocalyptic number.

It is an amenable number.

999964597 is a deficient number, since it is larger than the sum of its proper divisors (1).

999964597 is an equidigital number, since it uses as much as digits as its factorization.

999964597 is an evil number, because the sum of its binary digits is even.

The product of its digits is 49601160, while the sum is 67.

The square root of 999964597 is about 31622.2168261493. The cubic root of 999964597 is about 999.9881988607.

The spelling of 999964597 in words is "nine hundred ninety-nine million, nine hundred sixty-four thousand, five hundred ninety-seven".