679979129 has 2 divisors, whose sum is σ = 679979130. Its totient is φ = 679979128.

The previous prime is 679979101. The next prime is 679979143. The reversal of 679979129 is 921979976.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 674596729 + 5382400 = 25973^2 + 2320^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-679979129 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (679979929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339989564 + 339989565.

It is an arithmetic number, because the mean of its divisors is an integer number (339989565).

Almost surely, 2^679979129 is an apocalyptic number.

It is an amenable number.

679979129 is a deficient number, since it is larger than the sum of its proper divisors (1).

679979129 is an equidigital number, since it uses as much as digits as its factorization.

679979129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3857868, while the sum is 59.

The square root of 679979129 is about 26076.4094345828. The cubic root of 679979129 is about 879.3569376502.

The spelling of 679979129 in words is "six hundred seventy-nine million, nine hundred seventy-nine thousand, one hundred twenty-nine".