679404221 has 2 divisors, whose sum is σ = 679404222. Its totient is φ = 679404220.

The previous prime is 679404181. The next prime is 679404239. The reversal of 679404221 is 122404976.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 619512100 + 59892121 = 24890^2 + 7739^2 .

It is a cyclic number.

It is not a de Polignac number, because 679404221 - 2¹⁸ = 679142077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (679404241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339702110 + 339702111.

It is an arithmetic number, because the mean of its divisors is an integer number (339702111).

Almost surely, 2^679404221 is an apocalyptic number.

It is an amenable number.

679404221 is a deficient number, since it is larger than the sum of its proper divisors (1).

679404221 is an equidigital number, since it uses as much as digits as its factorization.

679404221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 679404221 is about 26065.3835766904. The cubic root of 679404221 is about 879.1090418640.

The spelling of 679404221 in words is "six hundred seventy-nine million, four hundred four thousand, two hundred twenty-one".