679983949 has 2 divisors, whose sum is σ = 679983950. Its totient is φ = 679983948.

The previous prime is 679983943. The next prime is 679983961. The reversal of 679983949 is 949389976.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 630913924 + 49070025 = 25118^2 + 7005^2 .

It is a cyclic number.

It is not a de Polignac number, because 679983949 - 2⁵ = 679983917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (679983943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339991974 + 339991975.

It is an arithmetic number, because the mean of its divisors is an integer number (339991975).

Almost surely, 2^679983949 is an apocalyptic number.

It is an amenable number.

679983949 is a deficient number, since it is larger than the sum of its proper divisors (1).

679983949 is an equidigital number, since it uses as much as digits as its factorization.

679983949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26453952, while the sum is 64.

The square root of 679983949 is about 26076.5018551185. The cubic root of 679983949 is about 879.3590154053.

The spelling of 679983949 in words is "six hundred seventy-nine million, nine hundred eighty-three thousand, nine hundred forty-nine".