1661233 has 4 divisors (see below), whose sum is σ = 1898560. Its totient is φ = 1423908.

The previous prime is 1661173. The next prime is 1661237. The reversal of 1661233 is 3321661.

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 a cyclic number.

It is not a de Polignac number, because 1661233 - 2⁹ = 1660721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1661237) 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, 118653 + ... + 118666.

It is an arithmetic number, because the mean of its divisors is an integer number (474640).

2^1661233 is an apocalyptic number.

It is an amenable number.

1661233 is a deficient number, since it is larger than the sum of its proper divisors (237327).

1661233 is an equidigital number, since it uses as much as digits as its factorization.

1661233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237326.

The product of its digits is 648, while the sum is 22.

The square root of 1661233 is about 1288.8882806512. Note that the first 3 decimals coincide. The cubic root of 1661233 is about 118.4341233898.

Adding to 1661233 its reverse (3321661), we get a palindrome (4982894).

The spelling of 1661233 in words is "one million, six hundred sixty-one thousand, two hundred thirty-three".