609911813 has 4 divisors (see below), whose sum is σ = 697042080. Its totient is φ = 522781548.

The previous prime is 609911791. The next prime is 609911833. The reversal of 609911813 is 318119906.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 609911813 - 2¹² = 609907717 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (609911833) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43565123 + ... + 43565136.

It is an arithmetic number, because the mean of its divisors is an integer number (174260520).

Almost surely, 2^609911813 is an apocalyptic number.

It is an amenable number.

609911813 is a deficient number, since it is larger than the sum of its proper divisors (87130267).

609911813 is an equidigital number, since it uses as much as digits as its factorization.

609911813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87130266.

The product of its (nonzero) digits is 11664, while the sum is 38.

The square root of 609911813 is about 24696.3927122971. The cubic root of 609911813 is about 848.0517376208.

The spelling of 609911813 in words is "six hundred nine million, nine hundred eleven thousand, eight hundred thirteen".