999720313 has 2 divisors, whose sum is σ = 999720314. Its totient is φ = 999720312.

The previous prime is 999720311. The next prime is 999720331. The reversal of 999720313 is 313027999.

Together with next prime (999720331) 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., 749226384 + 250493929 = 27372^2 + 15827^2 .

It is a cyclic number.

It is not a de Polignac number, because 999720313 - 2¹ = 999720311 is a prime.

Together with 999720311, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 999720313.

It is not a weakly prime, because it can be changed into another prime (999720311) 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, 499860156 + 499860157.

It is an arithmetic number, because the mean of its divisors is an integer number (499860157).

Almost surely, 2^999720313 is an apocalyptic number.

It is an amenable number.

999720313 is a deficient number, since it is larger than the sum of its proper divisors (1).

999720313 is an equidigital number, since it uses as much as digits as its factorization.

999720313 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 91854, while the sum is 43.

The square root of 999720313 is about 31618.3540526701. The cubic root of 999720313 is about 999.9067623070.

The spelling of 999720313 in words is "nine hundred ninety-nine million, seven hundred twenty thousand, three hundred thirteen".