647383657 has 2 divisors, whose sum is σ = 647383658. Its totient is φ = 647383656.

The previous prime is 647383631. The next prime is 647383661. The reversal of 647383657 is 756383746.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 384003216 + 263380441 = 19596^2 + 16229^2 .

It is a cyclic number.

It is not a de Polignac number, because 647383657 - 2¹⁵ = 647350889 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 647383657.

It is not a weakly prime, because it can be changed into another prime (647383697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323691828 + 323691829.

It is an arithmetic number, because the mean of its divisors is an integer number (323691829).

Almost surely, 2^647383657 is an apocalyptic number.

It is an amenable number.

647383657 is a deficient number, since it is larger than the sum of its proper divisors (1).

647383657 is an equidigital number, since it uses as much as digits as its factorization.

647383657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2540160, while the sum is 49.

The square root of 647383657 is about 25443.7351228156. The cubic root of 647383657 is about 865.0752969971.

The spelling of 647383657 in words is "six hundred forty-seven million, three hundred eighty-three thousand, six hundred fifty-seven".