8561213 has 2 divisors, whose sum is σ = 8561214. Its totient is φ = 8561212.

The previous prime is 8561159. The next prime is 8561237. The reversal of 8561213 is 3121658.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7963684 + 597529 = 2822^2 + 773^2 .

It is a cyclic number.

It is not a de Polignac number, because 8561213 - 2⁸ = 8560957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8561263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4280606 + 4280607.

It is an arithmetic number, because the mean of its divisors is an integer number (4280607).

Almost surely, 2^8561213 is an apocalyptic number.

It is an amenable number.

8561213 is a deficient number, since it is larger than the sum of its proper divisors (1).

8561213 is an equidigital number, since it uses as much as digits as its factorization.

8561213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1440, while the sum is 26.

The square root of 8561213 is about 2925.9550577546. The cubic root of 8561213 is about 204.5714864168.

The spelling of 8561213 in words is "eight million, five hundred sixty-one thousand, two hundred thirteen".