611909 has 4 divisors (see below), whose sum is σ = 631680. Its totient is φ = 592140.

The previous prime is 611903. The next prime is 611921. The reversal of 611909 is 909116.

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 611909 - 2¹² = 607813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (611903) 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, 9839 + ... + 9900.

It is an arithmetic number, because the mean of its divisors is an integer number (157920).

2⁶¹¹⁹⁰⁹ is an apocalyptic number.

It is an amenable number.

611909 is a deficient number, since it is larger than the sum of its proper divisors (19771).

611909 is a wasteful number, since it uses less digits than its factorization.

611909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19770.

The product of its (nonzero) digits is 486, while the sum is 26.

The square root of 611909 is about 782.2461249505. The cubic root of 611909 is about 84.8976391811.

The spelling of 611909 in words is "six hundred eleven thousand, nine hundred nine".