999997999513 has 2 divisors, whose sum is σ = 999997999514. Its totient is φ = 999997999512.

The previous prime is 999997999489. The next prime is 999997999523. The reversal of 999997999513 is 315999799999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 844566514009 + 155431485504 = 919003^2 + 394248^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999997999513 is a prime.

It is not a weakly prime, because it can be changed into another prime (999997999523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499998999756 + 499998999757.

It is an arithmetic number, because the mean of its divisors is an integer number (499998999757).

Almost surely, 2^999997999513 is an apocalyptic number.

It is an amenable number.

999997999513 is a deficient number, since it is larger than the sum of its proper divisors (1).

999997999513 is an equidigital number, since it uses as much as digits as its factorization.

999997999513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4519905705, while the sum is 88.

The spelling of 999997999513 in words is "nine hundred ninety-nine billion, nine hundred ninety-seven million, nine hundred ninety-nine thousand, five hundred thirteen".