647800493 has 2 divisors, whose sum is σ = 647800494. Its totient is φ = 647800492.

The previous prime is 647800481. The next prime is 647800499. The reversal of 647800493 is 394008746.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 636956644 + 10843849 = 25238^2 + 3293^2 .

It is a cyclic number.

It is not a de Polignac number, because 647800493 - 2⁶ = 647800429 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 647800493.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (647800499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323900246 + 323900247.

It is an arithmetic number, because the mean of its divisors is an integer number (323900247).

Almost surely, 2^647800493 is an apocalyptic number.

It is an amenable number.

647800493 is a deficient number, since it is larger than the sum of its proper divisors (1).

647800493 is an equidigital number, since it uses as much as digits as its factorization.

647800493 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 41.

The square root of 647800493 is about 25451.9251334747. The cubic root of 647800493 is about 865.2609247709.

The spelling of 647800493 in words is "six hundred forty-seven million, eight hundred thousand, four hundred ninety-three".