999959993 has 2 divisors, whose sum is σ = 999959994. Its totient is φ = 999959992.

The previous prime is 999959981. The next prime is 999960011. The reversal of 999959993 is 399959999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 743543824 + 256416169 = 27268^2 + 16013^2 .

It is a cyclic number.

It is not a de Polignac number, because 999959993 - 2⁴ = 999959977 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (999959903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499979996 + 499979997.

It is an arithmetic number, because the mean of its divisors is an integer number (499979997).

Almost surely, 2^999959993 is an apocalyptic number.

It is an amenable number.

999959993 is a deficient number, since it is larger than the sum of its proper divisors (1).

999959993 is an equidigital number, since it uses as much as digits as its factorization.

999959993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 71744535, while the sum is 71.

The square root of 999959993 is about 31622.1440291451. The cubic root of 999959993 is about 999.9866641555.

The spelling of 999959993 in words is "nine hundred ninety-nine million, nine hundred fifty-nine thousand, nine hundred ninety-three".