647526989 has 2 divisors, whose sum is σ = 647526990. Its totient is φ = 647526988.

The previous prime is 647526953. The next prime is 647527003. The reversal of 647526989 is 989625746.

It is a happy number.

647526989 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 can be written as a sum of positive squares in only one way, i.e., 607622500 + 39904489 = 24650^2 + 6317^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-647526989 is a prime.

It is a super-2 number, since 2×647526989² = 838582402966812242, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (647526949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323763494 + 323763495.

It is an arithmetic number, because the mean of its divisors is an integer number (323763495).

Almost surely, 2^647526989 is an apocalyptic number.

It is an amenable number.

647526989 is a deficient number, since it is larger than the sum of its proper divisors (1).

647526989 is an equidigital number, since it uses as much as digits as its factorization.

647526989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6531840, while the sum is 56.

The square root of 647526989 is about 25446.5516131361. The cubic root of 647526989 is about 865.1391354034.

The spelling of 647526989 in words is "six hundred forty-seven million, five hundred twenty-six thousand, nine hundred eighty-nine".