647911213 has 2 divisors, whose sum is σ = 647911214. Its totient is φ = 647911212.

The previous prime is 647911183. The next prime is 647911217. The reversal of 647911213 is 312119746.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 624900004 + 23011209 = 24998^2 + 4797^2 .

It is a cyclic number.

It is not a de Polignac number, because 647911213 - 2⁹ = 647910701 is a prime.

It is a super-2 number, since 2×647911213² = 839577879862262738, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (647911217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323955606 + 323955607.

It is an arithmetic number, because the mean of its divisors is an integer number (323955607).

Almost surely, 2^647911213 is an apocalyptic number.

It is an amenable number.

647911213 is a deficient number, since it is larger than the sum of its proper divisors (1).

647911213 is an equidigital number, since it uses as much as digits as its factorization.

647911213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9072, while the sum is 34.

The square root of 647911213 is about 25454.1001215914. The cubic root of 647911213 is about 865.3102178445.

The spelling of 647911213 in words is "six hundred forty-seven million, nine hundred eleven thousand, two hundred thirteen".