25216869 has 16 divisors (see below), whose sum is σ = 34775168. Its totient is φ = 16241472.

The previous prime is 25216861. The next prime is 25216871. The reversal of 25216869 is 96861252.

25216869 = 112² + 113² + ... + 425².

It is not a de Polignac number, because 25216869 - 2³ = 25216861 is a prime.

It is a super-2 number, since 2×25216869² = 1271780964326322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25216861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16704 + ... + 18150.

It is an arithmetic number, because the mean of its divisors is an integer number (2173448).

Almost surely, 2^25216869 is an apocalyptic number.

It is an amenable number.

25216869 is a deficient number, since it is larger than the sum of its proper divisors (9558299).

25216869 is a wasteful number, since it uses less digits than its factorization.

25216869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1644.

The product of its digits is 51840, while the sum is 39.

The square root of 25216869 is about 5021.6400707339. The cubic root of 25216869 is about 293.2448457554.

The spelling of 25216869 in words is "twenty-five million, two hundred sixteen thousand, eight hundred sixty-nine".