611998 has 4 divisors (see below), whose sum is σ = 918000. Its totient is φ = 305998.

The previous prime is 611993. The next prime is 611999. The reversal of 611998 is 899116.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (611993) 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 as a sum of consecutive naturals, namely, 152998 + ... + 153001.

It is an arithmetic number, because the mean of its divisors is an integer number (229500).

2⁶¹¹⁹⁹⁸ is an apocalyptic number.

611998 is a deficient number, since it is larger than the sum of its proper divisors (306002).

611998 is a wasteful number, since it uses less digits than its factorization.

611998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306001.

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

The square root of 611998 is about 782.3030103483. The cubic root of 611998 is about 84.9017550020.

The spelling of 611998 in words is "six hundred eleven thousand, nine hundred ninety-eight".