23133661 has 4 divisors (see below), whose sum is σ = 23174332. Its totient is φ = 23092992.

The previous prime is 23133647. The next prime is 23133667. The reversal of 23133661 is 16633132.

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

It can be written as a sum of positive squares in 2 ways, for example, as 13461561 + 9672100 = 3669^2 + 3110^2 .

It is a cyclic number.

It is not a de Polignac number, because 23133661 - 2⁵ = 23133629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23133667) 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, 19470 + ... + 20623.

It is an arithmetic number, because the mean of its divisors is an integer number (5793583).

Almost surely, 2^23133661 is an apocalyptic number.

It is an amenable number.

23133661 is a deficient number, since it is larger than the sum of its proper divisors (40671).

23133661 is an equidigital number, since it uses as much as digits as its factorization.

23133661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40670.

The product of its digits is 1944, while the sum is 25.

The square root of 23133661 is about 4809.7464590142. The cubic root of 23133661 is about 284.9365242857.

Adding to 23133661 its reverse (16633132), we get a palindrome (39766793).

The spelling of 23133661 in words is "twenty-three million, one hundred thirty-three thousand, six hundred sixty-one".