25242551 has 4 divisors (see below), whose sum is σ = 25393872. Its totient is φ = 25091232.

The previous prime is 25242533. The next prime is 25242589. The reversal of 25242551 is 15524252.

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 25242551 - 2¹⁸ = 24980407 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25242551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25241551) 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, 75410 + ... + 75743.

It is an arithmetic number, because the mean of its divisors is an integer number (6348468).

Almost surely, 2^25242551 is an apocalyptic number.

25242551 is a deficient number, since it is larger than the sum of its proper divisors (151321).

25242551 is a wasteful number, since it uses less digits than its factorization.

25242551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151320.

The product of its digits is 4000, while the sum is 26.

The square root of 25242551 is about 5024.1965526838. The cubic root of 25242551 is about 293.3443632503.

The spelling of 25242551 in words is "twenty-five million, two hundred forty-two thousand, five hundred fifty-one".