647725213 has 2 divisors, whose sum is σ = 647725214. Its totient is φ = 647725212.

The previous prime is 647725207. The next prime is 647725229. The reversal of 647725213 is 312527746.

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., 630110404 + 17614809 = 25102^2 + 4197^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-647725213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (647722213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323862606 + 323862607.

It is an arithmetic number, because the mean of its divisors is an integer number (323862607).

Almost surely, 2^647725213 is an apocalyptic number.

It is an amenable number.

647725213 is a deficient number, since it is larger than the sum of its proper divisors (1).

647725213 is an equidigital number, since it uses as much as digits as its factorization.

647725213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 70560, while the sum is 37.

The square root of 647725213 is about 25450.4462239859. The cubic root of 647725213 is about 865.2274065471.

It can be divided in two parts, 64 and 7725213, that added together give a palindrome (7725277).

The spelling of 647725213 in words is "six hundred forty-seven million, seven hundred twenty-five thousand, two hundred thirteen".