25172123 has 2 divisors, whose sum is σ = 25172124. Its totient is φ = 25172122.

The previous prime is 25172117. The next prime is 25172167. The reversal of 25172123 is 32127152.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25172123 - 2¹⁰ = 25171099 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (25172113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12586061 + 12586062.

It is an arithmetic number, because the mean of its divisors is an integer number (12586062).

Almost surely, 2^25172123 is an apocalyptic number.

25172123 is a deficient number, since it is larger than the sum of its proper divisors (1).

25172123 is an equidigital number, since it uses as much as digits as its factorization.

25172123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 840, while the sum is 23.

The square root of 25172123 is about 5017.1827752236. The cubic root of 25172123 is about 293.0712939069.

Adding to 25172123 its reverse (32127152), we get a palindrome (57299275).

The spelling of 25172123 in words is "twenty-five million, one hundred seventy-two thousand, one hundred twenty-three".