679501549 has 2 divisors, whose sum is σ = 679501550. Its totient is φ = 679501548.

The previous prime is 679501547. The next prime is 679501583. The reversal of 679501549 is 945105976.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 630361449 + 49140100 = 25107^2 + 7010^2 .

It is a cyclic number.

It is not a de Polignac number, because 679501549 - 2¹ = 679501547 is a prime.

Together with 679501547, 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 = 679501499 and 679501508.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (679501547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339750774 + 339750775.

It is an arithmetic number, because the mean of its divisors is an integer number (339750775).

Almost surely, 2^679501549 is an apocalyptic number.

It is an amenable number.

679501549 is a deficient number, since it is larger than the sum of its proper divisors (1).

679501549 is an equidigital number, since it uses as much as digits as its factorization.

679501549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 340200, while the sum is 46.

The square root of 679501549 is about 26067.2505071018. The cubic root of 679501549 is about 879.1510187592.

The spelling of 679501549 in words is "six hundred seventy-nine million, five hundred one thousand, five hundred forty-nine".