23172161 has 2 divisors, whose sum is σ = 23172162. Its totient is φ = 23172160.

The previous prime is 23172137. The next prime is 23172167. The reversal of 23172161 is 16127132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22848400 + 323761 = 4780^2 + 569^2 .

It is a cyclic number.

It is not a de Polignac number, because 23172161 - 2¹⁴ = 23155777 is a prime.

It is not a weakly prime, because it can be changed into another prime (23172167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11586080 + 11586081.

It is an arithmetic number, because the mean of its divisors is an integer number (11586081).

Almost surely, 2^23172161 is an apocalyptic number.

It is an amenable number.

23172161 is a deficient number, since it is larger than the sum of its proper divisors (1).

23172161 is an equidigital number, since it uses as much as digits as its factorization.

23172161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 504, while the sum is 23.

The square root of 23172161 is about 4813.7470851718. The cubic root of 23172161 is about 285.0945044140.

Adding to 23172161 its reverse (16127132), we get a palindrome (39299293).

The spelling of 23172161 in words is "twenty-three million, one hundred seventy-two thousand, one hundred sixty-one".