999670993 has 2 divisors, whose sum is σ = 999670994. Its totient is φ = 999670992.

The previous prime is 999670957. The next prime is 999671027. The reversal of 999670993 is 399076999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 996791184 + 2879809 = 31572^2 + 1697^2 .

It is an emirp because it is prime and its reverse (399076999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 999670993 - 2⁹ = 999670481 is a prime.

It is not a weakly prime, because it can be changed into another prime (999670943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499835496 + 499835497.

It is an arithmetic number, because the mean of its divisors is an integer number (499835497).

Almost surely, 2^999670993 is an apocalyptic number.

It is an amenable number.

999670993 is a deficient number, since it is larger than the sum of its proper divisors (1).

999670993 is an equidigital number, since it uses as much as digits as its factorization.

999670993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7440174, while the sum is 61.

The square root of 999670993 is about 31617.5741163044. The cubic root of 999670993 is about 999.8903189705.

The spelling of 999670993 in words is "nine hundred ninety-nine million, six hundred seventy thousand, nine hundred ninety-three".