661124 has 12 divisors (see below), whose sum is σ = 1218000. Its totient is φ = 313128.

The previous prime is 661121. The next prime is 661139. The reversal of 661124 is 421166.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 661096 and 661105.

It is not an unprimeable number, because it can be changed into a prime (661121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4274 + ... + 4425.

It is an arithmetic number, because the mean of its divisors is an integer number (101500).

2⁶⁶¹¹²⁴ is an apocalyptic number.

It is an amenable number.

661124 is a deficient number, since it is larger than the sum of its proper divisors (556876).

661124 is a wasteful number, since it uses less digits than its factorization.

661124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8722 (or 8720 counting only the distinct ones).

The product of its digits is 288, while the sum is 20.

The square root of 661124 is about 813.0953203653. The cubic root of 661124 is about 87.1152741563.

The spelling of 661124 in words is "six hundred sixty-one thousand, one hundred twenty-four".