1647613213 has 2 divisors, whose sum is σ = 1647613214. Its totient is φ = 1647613212.

The previous prime is 1647613199. The next prime is 1647613229. The reversal of 1647613213 is 3123167461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1307690244 + 339922969 = 36162^2 + 18437^2 .

It is a cyclic number.

It is not a de Polignac number, because 1647613213 - 2²⁹ = 1110742301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1647613313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 823806606 + 823806607.

It is an arithmetic number, because the mean of its divisors is an integer number (823806607).

Almost surely, 2^1647613213 is an apocalyptic number.

It is an amenable number.

1647613213 is a deficient number, since it is larger than the sum of its proper divisors (1).

1647613213 is an equidigital number, since it uses as much as digits as its factorization.

1647613213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 34.

The square root of 1647613213 is about 40590.8020738689. The cubic root of 1647613213 is about 1181.0957008764.

The spelling of 1647613213 in words is "one billion, six hundred forty-seven million, six hundred thirteen thousand, two hundred thirteen".