2805217213 has 2 divisors, whose sum is σ = 2805217214. Its totient is φ = 2805217212.

The previous prime is 2805217211. The next prime is 2805217229. The reversal of 2805217213 is 3127125082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1607849604 + 1197367609 = 40098^2 + 34603^2 .

It is a cyclic number.

It is not a de Polignac number, because 2805217213 - 2¹ = 2805217211 is a prime.

It is a super-2 number, since 2×2805217213² = 15738487224222974738, which contains 22 as substring.

Together with 2805217211, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2805217211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1402608606 + 1402608607.

It is an arithmetic number, because the mean of its divisors is an integer number (1402608607).

Almost surely, 2^2805217213 is an apocalyptic number.

It is an amenable number.

2805217213 is a deficient number, since it is larger than the sum of its proper divisors (1).

2805217213 is an equidigital number, since it uses as much as digits as its factorization.

2805217213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 2805217213 is about 52964.3013075789. The cubic root of 2805217213 is about 1410.3346141783.

The spelling of 2805217213 in words is "two billion, eight hundred five million, two hundred seventeen thousand, two hundred thirteen".