647579399 has 2 divisors, whose sum is σ = 647579400. Its totient is φ = 647579398.

The previous prime is 647579369. The next prime is 647579417. The reversal of 647579399 is 993975746.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-647579399 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (647579369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323789699 + 323789700.

It is an arithmetic number, because the mean of its divisors is an integer number (323789700).

Almost surely, 2^647579399 is an apocalyptic number.

647579399 is a deficient number, since it is larger than the sum of its proper divisors (1).

647579399 is an equidigital number, since it uses as much as digits as its factorization.

647579399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12859560, while the sum is 59.

The square root of 647579399 is about 25447.5813978460. The cubic root of 647579399 is about 865.1624758559.

The spelling of 647579399 in words is "six hundred forty-seven million, five hundred seventy-nine thousand, three hundred ninety-nine".