25217471 has 4 divisors (see below), whose sum is σ = 25298352. Its totient is φ = 25136592.

The previous prime is 25217447. The next prime is 25217473. The reversal of 25217471 is 17471252.

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

It is a cyclic number.

It is not a de Polignac number, because 25217471 - 2¹⁸ = 24955327 is a prime.

It is a super-3 number, since 3×25217471³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25217473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39971 + ... + 40596.

It is an arithmetic number, because the mean of its divisors is an integer number (6324588).

Almost surely, 2^25217471 is an apocalyptic number.

25217471 is a deficient number, since it is larger than the sum of its proper divisors (80881).

25217471 is an equidigital number, since it uses as much as digits as its factorization.

25217471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80880.

The product of its digits is 3920, while the sum is 29.

The square root of 25217471 is about 5021.7000109525. The cubic root of 25217471 is about 293.2471792726.

The spelling of 25217471 in words is "twenty-five million, two hundred seventeen thousand, four hundred seventy-one".