999599857 has 2 divisors, whose sum is σ = 999599858. Its totient is φ = 999599856.

The previous prime is 999599827. The next prime is 999599891. The reversal of 999599857 is 758995999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 875923216 + 123676641 = 29596^2 + 11121^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999599857 is a prime.

It is a super-2 number, since 2×999599857² = 1998399748228840898, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (999599827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499799928 + 499799929.

It is an arithmetic number, because the mean of its divisors is an integer number (499799929).

Almost surely, 2^999599857 is an apocalyptic number.

It is an amenable number.

999599857 is a deficient number, since it is larger than the sum of its proper divisors (1).

999599857 is an equidigital number, since it uses as much as digits as its factorization.

999599857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 82668600, while the sum is 70.

The square root of 999599857 is about 31616.4491523005. The cubic root of 999599857 is about 999.8666012056.

The spelling of 999599857 in words is "nine hundred ninety-nine million, five hundred ninety-nine thousand, eight hundred fifty-seven".