1679999917 has 2 divisors, whose sum is σ = 1679999918. Its totient is φ = 1679999916.

The previous prime is 1679999869. The next prime is 1679999947. The reversal of 1679999917 is 7199999761.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1668804201 + 11195716 = 40851^2 + 3346^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1679999917 is a prime.

It is a super-2 number, since 2×1679999917² = 5644799442240013778, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1679999947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 839999958 + 839999959.

It is an arithmetic number, because the mean of its divisors is an integer number (839999959).

Almost surely, 2^1679999917 is an apocalyptic number.

It is an amenable number.

1679999917 is a deficient number, since it is larger than the sum of its proper divisors (1).

1679999917 is an equidigital number, since it uses as much as digits as its factorization.

1679999917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17360406, while the sum is 67.

The square root of 1679999917 is about 40987.8020513421. The cubic root of 1679999917 is about 1188.7843709754.

The spelling of 1679999917 in words is "one billion, six hundred seventy-nine million, nine hundred ninety-nine thousand, nine hundred seventeen".