647548129 has 2 divisors, whose sum is σ = 647548130. Its totient is φ = 647548128.

The previous prime is 647548081. The next prime is 647548199. The reversal of 647548129 is 921845746.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 589178529 + 58369600 = 24273^2 + 7640^2 .

It is a cyclic number.

It is not a de Polignac number, because 647548129 - 2¹⁵ = 647515361 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (647548199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323774064 + 323774065.

It is an arithmetic number, because the mean of its divisors is an integer number (323774065).

Almost surely, 2^647548129 is an apocalyptic number.

It is an amenable number.

647548129 is a deficient number, since it is larger than the sum of its proper divisors (1).

647548129 is an equidigital number, since it uses as much as digits as its factorization.

647548129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 483840, while the sum is 46.

The square root of 647548129 is about 25446.9669901935. The cubic root of 647548129 is about 865.1485501164.

The spelling of 647548129 in words is "six hundred forty-seven million, five hundred forty-eight thousand, one hundred twenty-nine".