679517 has 2 divisors, whose sum is σ = 679518. Its totient is φ = 679516.

The previous prime is 679501. The next prime is 679519. The reversal of 679517 is 715976.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 674041 + 5476 = 821^2 + 74^2 .

It is a cyclic number.

It is not a de Polignac number, because 679517 - 2⁴ = 679501 is a prime.

Together with 679519, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (679519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339758 + 339759.

It is an arithmetic number, because the mean of its divisors is an integer number (339759).

2⁶⁷⁹⁵¹⁷ is an apocalyptic number.

It is an amenable number.

679517 is a deficient number, since it is larger than the sum of its proper divisors (1).

679517 is an equidigital number, since it uses as much as digits as its factorization.

679517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13230, while the sum is 35.

The square root of 679517 is about 824.3282113333. The cubic root of 679517 is about 87.9157682300.

The spelling of 679517 in words is "six hundred seventy-nine thousand, five hundred seventeen".