999972313 has 2 divisors, whose sum is σ = 999972314. Its totient is φ = 999972312.

The previous prime is 999972289. The next prime is 999972319. The reversal of 999972313 is 313279999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 777127129 + 222845184 = 27877^2 + 14928^2 .

It is a cyclic number.

It is not a de Polignac number, because 999972313 - 2⁹ = 999971801 is a prime.

It is not a weakly prime, because it can be changed into another prime (999972319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499986156 + 499986157.

It is an arithmetic number, because the mean of its divisors is an integer number (499986157).

Almost surely, 2^999972313 is an apocalyptic number.

It is an amenable number.

999972313 is a deficient number, since it is larger than the sum of its proper divisors (1).

999972313 is an equidigital number, since it uses as much as digits as its factorization.

999972313 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 826686, while the sum is 52.

The square root of 999972313 is about 31622.3388287457. The cubic root of 999972313 is about 999.9907709148.

The spelling of 999972313 in words is "nine hundred ninety-nine million, nine hundred seventy-two thousand, three hundred thirteen".