647801899 has 2 divisors, whose sum is σ = 647801900. Its totient is φ = 647801898.

The previous prime is 647801873. The next prime is 647801909. The reversal of 647801899 is 998108746.

It is a happy number.

647801899 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 647801899 - 2⁹ = 647801387 is a prime.

It is a super-3 number, since 3×647801899³ (a number of 27 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (647801839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323900949 + 323900950.

It is an arithmetic number, because the mean of its divisors is an integer number (323900950).

Almost surely, 2^647801899 is an apocalyptic number.

647801899 is a deficient number, since it is larger than the sum of its proper divisors (1).

647801899 is an equidigital number, since it uses as much as digits as its factorization.

647801899 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 870912, while the sum is 52.

The square root of 647801899 is about 25451.9527541601. The cubic root of 647801899 is about 865.2615507640.

The spelling of 647801899 in words is "six hundred forty-seven million, eight hundred one thousand, eight hundred ninety-nine".