661126 has 4 divisors (see below), whose sum is σ = 991692. Its totient is φ = 330562.

The previous prime is 661121. The next prime is 661139. The reversal of 661126 is 621166.

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

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 661097 and 661106.

It is a congruent number.

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

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165280 + ... + 165283.

It is an arithmetic number, because the mean of its divisors is an integer number (247923).

2⁶⁶¹¹²⁶ is an apocalyptic number.

661126 is a deficient number, since it is larger than the sum of its proper divisors (330566).

661126 is a wasteful number, since it uses less digits than its factorization.

661126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330565.

The product of its digits is 432, while the sum is 22.

The square root of 661126 is about 813.0965502325. The cubic root of 661126 is about 87.1153620018.

It can be divided in two parts, 661 and 126, that added together give a palindrome (787).

The spelling of 661126 in words is "six hundred sixty-one thousand, one hundred twenty-six".