25395551 has 4 divisors (see below), whose sum is σ = 25528704. Its totient is φ = 25262400.

The previous prime is 25395509. The next prime is 25395641. The reversal of 25395551 is 15559352.

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 25395551 - 2¹⁰ = 25394527 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25395451) 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, 66290 + ... + 66671.

It is an arithmetic number, because the mean of its divisors is an integer number (6382176).

Almost surely, 2^25395551 is an apocalyptic number.

25395551 is a deficient number, since it is larger than the sum of its proper divisors (133153).

25395551 is a wasteful number, since it uses less digits than its factorization.

25395551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133152.

The product of its digits is 33750, while the sum is 35.

The square root of 25395551 is about 5039.3998650633. The cubic root of 25395551 is about 293.9358422022.

The spelling of 25395551 in words is "twenty-five million, three hundred ninety-five thousand, five hundred fifty-one".