25871551 has 4 divisors (see below), whose sum is σ = 26075392. Its totient is φ = 25667712.

The previous prime is 25871543. The next prime is 25871561. The reversal of 25871551 is 15517852.

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 25871551 - 2³ = 25871543 is a prime.

It is a super-2 number, since 2×25871551² = 1338674302291202, which contains 22 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 (25871561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101730 + ... + 101983.

It is an arithmetic number, because the mean of its divisors is an integer number (6518848).

Almost surely, 2^25871551 is an apocalyptic number.

25871551 is a deficient number, since it is larger than the sum of its proper divisors (203841).

25871551 is a wasteful number, since it uses less digits than its factorization.

25871551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203840.

The product of its digits is 14000, while the sum is 34.

The square root of 25871551 is about 5086.4084578413. The cubic root of 25871551 is about 295.7609426965.

The spelling of 25871551 in words is "twenty-five million, eight hundred seventy-one thousand, five hundred fifty-one".