25155281 has 4 divisors (see below), whose sum is σ = 25224192. Its totient is φ = 25086372.

The previous prime is 25155239. The next prime is 25155287. The reversal of 25155281 is 18255152.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25155281 is a prime.

It is a super-2 number, since 2×25155281² = 1265576324377922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25155287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33905 + ... + 34638.

It is an arithmetic number, because the mean of its divisors is an integer number (6306048).

Almost surely, 2^25155281 is an apocalyptic number.

It is an amenable number.

25155281 is a deficient number, since it is larger than the sum of its proper divisors (68911).

25155281 is an equidigital number, since it uses as much as digits as its factorization.

25155281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68910.

The product of its digits is 4000, while the sum is 29.

The square root of 25155281 is about 5015.5040624049. The cubic root of 25155281 is about 293.0059172470.

The spelling of 25155281 in words is "twenty-five million, one hundred fifty-five thousand, two hundred eighty-one".