611985 has 16 divisors (see below), whose sum is σ = 1068480. Its totient is φ = 296640.

The previous prime is 611977. The next prime is 611993. The reversal of 611985 is 589116.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (611977) and next prime (611993).

It is not a de Polignac number, because 611985 - 2³ = 611977 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1690 + ... + 2019.

It is an arithmetic number, because the mean of its divisors is an integer number (66780).

2⁶¹¹⁹⁸⁵ is an apocalyptic number.

It is an amenable number.

611985 is a deficient number, since it is larger than the sum of its proper divisors (456495).

611985 is a wasteful number, since it uses less digits than its factorization.

611985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3728.

The product of its digits is 2160, while the sum is 30.

The square root of 611985 is about 782.2947015032. The cubic root of 611985 is about 84.9011538395.

It can be divided in two parts, 611 and 985, that added together give a triangular number (1596 = T₅₆).

The spelling of 611985 in words is "six hundred eleven thousand, nine hundred eighty-five".