647899081229 has 2 divisors, whose sum is σ = 647899081230. Its totient is φ = 647899081228.

The previous prime is 647899081213. The next prime is 647899081243. The reversal of 647899081229 is 922180998746.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 355899344329 + 291999736900 = 596573^2 + 540370^2 .

It is a cyclic number.

It is not a de Polignac number, because 647899081229 - 2⁴ = 647899081213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (647899081729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323949540614 + 323949540615.

It is an arithmetic number, because the mean of its divisors is an integer number (323949540615).

Almost surely, 2^647899081229 is an apocalyptic number.

It is an amenable number.

647899081229 is a deficient number, since it is larger than the sum of its proper divisors (1).

647899081229 is an equidigital number, since it uses as much as digits as its factorization.

647899081229 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31352832, while the sum is 65.

The spelling of 647899081229 in words is "six hundred forty-seven billion, eight hundred ninety-nine million, eighty-one thousand, two hundred twenty-nine".