25217871 has 16 divisors (see below), whose sum is σ = 38770944. Its totient is φ = 14281344.

The previous prime is 25217861. The next prime is 25217873. The reversal of 25217871 is 17871252.

It is not a de Polignac number, because 25217871 - 2⁷ = 25217743 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25217873) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2941 + ... + 7686.

It is an arithmetic number, because the mean of its divisors is an integer number (2423184).

Almost surely, 2^25217871 is an apocalyptic number.

25217871 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

25217871 is a deficient number, since it is larger than the sum of its proper divisors (13553073).

25217871 is a wasteful number, since it uses less digits than its factorization.

25217871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10750.

The product of its digits is 7840, while the sum is 33.

The square root of 25217871 is about 5021.7398379446. The cubic root of 25217871 is about 293.2487297618.

The spelling of 25217871 in words is "twenty-five million, two hundred seventeen thousand, eight hundred seventy-one".