25172001 has 12 divisors (see below), whose sum is σ = 36491728. Its totient is φ = 16720344.

The previous prime is 25171997. The next prime is 25172009. The reversal of 25172001 is 10027152.

It is not a de Polignac number, because 25172001 - 2² = 25171997 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25172009) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2395 + ... + 7488.

Almost surely, 2^25172001 is an apocalyptic number.

It is an amenable number.

25172001 is a deficient number, since it is larger than the sum of its proper divisors (11319727).

25172001 is a wasteful number, since it uses less digits than its factorization.

25172001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10172 (or 10169 counting only the distinct ones).

The product of its (nonzero) digits is 140, while the sum is 18.

The square root of 25172001 is about 5017.1706169912. The cubic root of 25172001 is about 293.0708204366.

Adding to 25172001 its reverse (10027152), we get a palindrome (35199153).

The spelling of 25172001 in words is "twenty-five million, one hundred seventy-two thousand, one".