215224813 has 2 divisors, whose sum is σ = 215224814. Its totient is φ = 215224812.

The previous prime is 215224781. The next prime is 215224817. The reversal of 215224813 is 318422512.

215224813 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 121947849 + 93276964 = 11043^2 + 9658^2 .

It is a cyclic number.

It is not a de Polignac number, because 215224813 - 2⁵ = 215224781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215224817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107612406 + 107612407.

It is an arithmetic number, because the mean of its divisors is an integer number (107612407).

Almost surely, 2^215224813 is an apocalyptic number.

It is an amenable number.

215224813 is a deficient number, since it is larger than the sum of its proper divisors (1).

215224813 is an equidigital number, since it uses as much as digits as its factorization.

215224813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3840, while the sum is 28.

The square root of 215224813 is about 14670.5423553460. The cubic root of 215224813 is about 599.2813738971.

It can be divided in two parts, 21522 and 4813, that added together give a triangular number (26335 = T₂₂₉).

The spelling of 215224813 in words is "two hundred fifteen million, two hundred twenty-four thousand, eight hundred thirteen".