609865213 has 2 divisors, whose sum is σ = 609865214. Its totient is φ = 609865212.

The previous prime is 609865199. The next prime is 609865219. The reversal of 609865213 is 312568906.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 566344804 + 43520409 = 23798^2 + 6597^2 .

It is a cyclic number.

It is not a de Polignac number, because 609865213 - 2¹³ = 609857021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (609865219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 304932606 + 304932607.

It is an arithmetic number, because the mean of its divisors is an integer number (304932607).

Almost surely, 2^609865213 is an apocalyptic number.

It is an amenable number.

609865213 is a deficient number, since it is larger than the sum of its proper divisors (1).

609865213 is an equidigital number, since it uses as much as digits as its factorization.

609865213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 77760, while the sum is 40.

The square root of 609865213 is about 24695.4492366509. The cubic root of 609865213 is about 848.0301387510.

The spelling of 609865213 in words is "six hundred nine million, eight hundred sixty-five thousand, two hundred thirteen".