16998857 has 2 divisors, whose sum is σ = 16998858. Its totient is φ = 16998856.

The previous prime is 16998833. The next prime is 16998859. The reversal of 16998857 is 75889961.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15808576 + 1190281 = 3976^2 + 1091^2 .

It is a cyclic number.

It is not a de Polignac number, because 16998857 - 2⁸ = 16998601 is a prime.

It is a super-2 number, since 2×16998857² = 577922278612898, which contains 22 as substring.

Together with 16998859, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 16998799 and 16998808.

It is not a weakly prime, because it can be changed into another prime (16998859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8499428 + 8499429.

It is an arithmetic number, because the mean of its divisors is an integer number (8499429).

Almost surely, 2^16998857 is an apocalyptic number.

It is an amenable number.

16998857 is a deficient number, since it is larger than the sum of its proper divisors (1).

16998857 is an equidigital number, since it uses as much as digits as its factorization.

16998857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1088640, while the sum is 53.

The square root of 16998857 is about 4122.9670141780. The cubic root of 16998857 is about 257.1223962409.

The spelling of 16998857 in words is "sixteen million, nine hundred ninety-eight thousand, eight hundred fifty-seven".