679081849 has 2 divisors, whose sum is σ = 679081850. Its totient is φ = 679081848.

The previous prime is 679081817. The next prime is 679081889. The reversal of 679081849 is 948180976.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 630361449 + 48720400 = 25107^2 + 6980^2 .

It is a cyclic number.

It is not a de Polignac number, because 679081849 - 2⁵ = 679081817 is a prime.

It is a super-2 number, since 2×679081849² = 922304315282517602, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 679081796 and 679081805.

It is not a weakly prime, because it can be changed into another prime (679081889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339540924 + 339540925.

It is an arithmetic number, because the mean of its divisors is an integer number (339540925).

Almost surely, 2^679081849 is an apocalyptic number.

It is an amenable number.

679081849 is a deficient number, since it is larger than the sum of its proper divisors (1).

679081849 is an equidigital number, since it uses as much as digits as its factorization.

679081849 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 870912, while the sum is 52.

The square root of 679081849 is about 26059.1989324308. The cubic root of 679081849 is about 878.9699764069.

The spelling of 679081849 in words is "six hundred seventy-nine million, eighty-one thousand, eight hundred forty-nine".