25121889 has 24 divisors (see below), whose sum is σ = 40039272. Its totient is φ = 15079680.

The previous prime is 25121881. The next prime is 25121891. The reversal of 25121889 is 98812152.

It can be written as a sum of positive squares in 4 ways, for example, as 321489 + 24800400 = 567^2 + 4980^2 .

It is not a de Polignac number, because 25121889 - 2³ = 25121881 is a prime.

It is a super-3 number, since 3×25121889³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25121881) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2179 + ... + 7415.

It is an arithmetic number, because the mean of its divisors is an integer number (1668303).

It is the magic constant of a 369 × 369 magic square.

Almost surely, 2^25121889 is an apocalyptic number.

It is an amenable number.

25121889 is a deficient number, since it is larger than the sum of its proper divisors (14917383).

25121889 is a wasteful number, since it uses less digits than its factorization.

25121889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5297 (or 5294 counting only the distinct ones).

The product of its digits is 11520, while the sum is 36.

The square root of 25121889 is about 5012.1740791796. The cubic root of 25121889 is about 292.8762110697.

The spelling of 25121889 in words is "twenty-five million, one hundred twenty-one thousand, eight hundred eighty-nine".