647004481 has 2 divisors, whose sum is σ = 647004482. Its totient is φ = 647004480.

The previous prime is 647004451. The next prime is 647004487. The reversal of 647004481 is 184400746.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 628003600 + 19000881 = 25060^2 + 4359^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-647004481 is a prime.

It is a super-2 number, since 2×647004481² = 837229596868158722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (647004487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323502240 + 323502241.

It is an arithmetic number, because the mean of its divisors is an integer number (323502241).

Almost surely, 2^647004481 is an apocalyptic number.

It is an amenable number.

647004481 is a deficient number, since it is larger than the sum of its proper divisors (1).

647004481 is an equidigital number, since it uses as much as digits as its factorization.

647004481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21504, while the sum is 34.

The square root of 647004481 is about 25436.2827669453. The cubic root of 647004481 is about 864.9063709677.

The spelling of 647004481 in words is "six hundred forty-seven million, four thousand, four hundred eighty-one".