647125289 has 2 divisors, whose sum is σ = 647125290. Its totient is φ = 647125288.

The previous prime is 647125277. The next prime is 647125331. The reversal of 647125289 is 982521746.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 406627225 + 240498064 = 20165^2 + 15508^2 .

It is a cyclic number.

It is not a de Polignac number, because 647125289 - 2¹⁶ = 647059753 is a prime.

It is a super-2 number, since 2×647125289² = 837542279326667042, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (647125249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323562644 + 323562645.

It is an arithmetic number, because the mean of its divisors is an integer number (323562645).

Almost surely, 2^647125289 is an apocalyptic number.

It is an amenable number.

647125289 is a deficient number, since it is larger than the sum of its proper divisors (1).

647125289 is an equidigital number, since it uses as much as digits as its factorization.

647125289 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 241920, while the sum is 44.

The square root of 647125289 is about 25438.6573741619. The cubic root of 647125289 is about 864.9601990886.

The spelling of 647125289 in words is "six hundred forty-seven million, one hundred twenty-five thousand, two hundred eighty-nine".