23172133 has 2 divisors, whose sum is σ = 23172134. Its totient is φ = 23172132.

The previous prime is 23172113. The next prime is 23172137. The reversal of 23172133 is 33127132.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18301284 + 4870849 = 4278^2 + 2207^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23172133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23172137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11586066 + 11586067.

It is an arithmetic number, because the mean of its divisors is an integer number (11586067).

Almost surely, 2^23172133 is an apocalyptic number.

It is an amenable number.

23172133 is a deficient number, since it is larger than the sum of its proper divisors (1).

23172133 is an equidigital number, since it uses as much as digits as its factorization.

23172133 is an evil number, because the sum of its binary digits is even.

The product of its digits is 756, while the sum is 22.

The square root of 23172133 is about 4813.7441768337. The cubic root of 23172133 is about 285.0943895830.

Adding to 23172133 its reverse (33127132), we get a palindrome (56299265).

The spelling of 23172133 in words is "twenty-three million, one hundred seventy-two thousand, one hundred thirty-three".