661233 has 4 divisors (see below), whose sum is σ = 881648. Its totient is φ = 440820.

The previous prime is 661231. The next prime is 661237. The reversal of 661233 is 332166.

661233 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 661233 - 2¹ = 661231 is a prime.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (661231) 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, 110203 + ... + 110208.

It is an arithmetic number, because the mean of its divisors is an integer number (220412).

2⁶⁶¹²³³ is an apocalyptic number.

It is an amenable number.

661233 is a deficient number, since it is larger than the sum of its proper divisors (220415).

661233 is a wasteful number, since it uses less digits than its factorization.

661233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220414.

The product of its digits is 648, while the sum is 21.

The square root of 661233 is about 813.1623454145. The cubic root of 661233 is about 87.1200614796.

Adding to 661233 its reverse (332166), we get a palindrome (993399).

The spelling of 661233 in words is "six hundred sixty-one thousand, two hundred thirty-three".