999318997 has 2 divisors, whose sum is σ = 999318998. Its totient is φ = 999318996.

The previous prime is 999318949. The next prime is 999319001. The reversal of 999318997 is 799813999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 602751601 + 396567396 = 24551^2 + 19914^2 .

It is an emirp because it is prime and its reverse (799813999) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999318997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999318937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499659498 + 499659499.

It is an arithmetic number, because the mean of its divisors is an integer number (499659499).

Almost surely, 2^999318997 is an apocalyptic number.

It is an amenable number.

999318997 is a deficient number, since it is larger than the sum of its proper divisors (1).

999318997 is an equidigital number, since it uses as much as digits as its factorization.

999318997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9920232, while the sum is 64.

The square root of 999318997 is about 31612.0071649998. The cubic root of 999318997 is about 999.7729474510.

The spelling of 999318997 in words is "nine hundred ninety-nine million, three hundred eighteen thousand, nine hundred ninety-seven".