611955 has 20 divisors (see below), whose sum is σ = 1097712. Its totient is φ = 326160.

The previous prime is 611953. The next prime is 611957. The reversal of 611955 is 559116.

It is an interprime number because it is at equal distance from previous prime (611953) and next prime (611957).

It is not a de Polignac number, because 611955 - 2¹ = 611953 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (611951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 351 + ... + 1160.

2⁶¹¹⁹⁵⁵ is an apocalyptic number.

611955 is a deficient number, since it is larger than the sum of its proper divisors (485757).

611955 is a wasteful number, since it uses less digits than its factorization.

611955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1528 (or 1519 counting only the distinct ones).

The product of its digits is 1350, while the sum is 27.

The square root of 611955 is about 782.2755269085. The cubic root of 611955 is about 84.8997665091.

It can be divided in two parts, 61 and 1955, that added together give a triangular number (2016 = T₆₃).

The spelling of 611955 in words is "six hundred eleven thousand, nine hundred fifty-five".