609956813 has 2 divisors, whose sum is σ = 609956814. Its totient is φ = 609956812.

The previous prime is 609956777. The next prime is 609956863. The reversal of 609956813 is 318659906.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 475327204 + 134629609 = 21802^2 + 11603^2 .

It is a cyclic number.

It is not a de Polignac number, because 609956813 - 2²⁸ = 341521357 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (609956863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 304978406 + 304978407.

It is an arithmetic number, because the mean of its divisors is an integer number (304978407).

Almost surely, 2^609956813 is an apocalyptic number.

It is an amenable number.

609956813 is a deficient number, since it is larger than the sum of its proper divisors (1).

609956813 is an equidigital number, since it uses as much as digits as its factorization.

609956813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 349920, while the sum is 47.

The square root of 609956813 is about 24697.3037597224. The cubic root of 609956813 is about 848.0725938543.

The spelling of 609956813 in words is "six hundred nine million, nine hundred fifty-six thousand, eight hundred thirteen".