611989 has 4 divisors (see below), whose sum is σ = 699424. Its totient is φ = 524556.

The previous prime is 611977. The next prime is 611993. The reversal of 611989 is 989116.

611989 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, 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 611989 - 2⁵ = 611957 is a prime.

It is a super-2 number, since 2×611989² = 749061072242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (611939) 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, 43707 + ... + 43720.

It is an arithmetic number, because the mean of its divisors is an integer number (174856).

2⁶¹¹⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

611989 is a deficient number, since it is larger than the sum of its proper divisors (87435).

611989 is an equidigital number, since it uses as much as digits as its factorization.

611989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87434.

The product of its digits is 3888, while the sum is 34.

The square root of 611989 is about 782.2972580803. The cubic root of 611989 is about 84.9013388135.

It can be divided in two parts, 611 and 989, that added together give a square (1600 = 40²).

The spelling of 611989 in words is "six hundred eleven thousand, nine hundred eighty-nine".