610909 has 4 divisors (see below), whose sum is σ = 657916. Its totient is φ = 563904.

The previous prime is 610891. The next prime is 610913. The reversal of 610909 is 909016.

610909 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 52900 + 558009 = 230^2 + 747^2 .

It is a cyclic number.

It is not a de Polignac number, because 610909 - 2⁵ = 610877 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

610909 is a modest number, since divided by 909 gives 61 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (610919) 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, 23484 + ... + 23509.

It is an arithmetic number, because the mean of its divisors is an integer number (164479).

2⁶¹⁰⁹⁰⁹ is an apocalyptic number.

It is an amenable number.

610909 is a deficient number, since it is larger than the sum of its proper divisors (47007).

610909 is a wasteful number, since it uses less digits than its factorization.

610909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47006.

The product of its (nonzero) digits is 486, while the sum is 25.

The square root of 610909 is about 781.6066785795. The cubic root of 610909 is about 84.8513665443.

The spelling of 610909 in words is "six hundred ten thousand, nine hundred nine".