661112 has 16 divisors (see below), whose sum is σ = 1293840. Its totient is φ = 316096.

The previous prime is 661109. The next prime is 661117. The reversal of 661112 is 211166.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661117) 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, 1613 + ... + 1980.

It is an arithmetic number, because the mean of its divisors is an integer number (80865).

2⁶⁶¹¹¹² is an apocalyptic number.

It is an amenable number.

661112 is a deficient number, since it is larger than the sum of its proper divisors (632728).

661112 is a wasteful number, since it uses less digits than its factorization.

661112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3622 (or 3618 counting only the distinct ones).

The product of its digits is 72, while the sum is 17.

The square root of 661112 is about 813.0879411232. The cubic root of 661112 is about 87.1147470793.

Adding to 661112 its reverse (211166), we get a palindrome (872278).

The spelling of 661112 in words is "six hundred sixty-one thousand, one hundred twelve".