25501145 has 4 divisors (see below), whose sum is σ = 30601380. Its totient is φ = 20400912.

The previous prime is 25501129. The next prime is 25501153. The reversal of 25501145 is 54110552.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4853209 + 20647936 = 2203^2 + 4544^2 .

It is a cyclic number.

It is not a de Polignac number, because 25501145 - 2⁴ = 25501129 is a prime.

It is a super-2 number, since 2×25501145² = 1300616792622050, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 25501145.

It is an unprimeable number.

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, 2550110 + ... + 2550119.

It is an arithmetic number, because the mean of its divisors is an integer number (7650345).

Almost surely, 2^25501145 is an apocalyptic number.

It is an amenable number.

25501145 is a deficient number, since it is larger than the sum of its proper divisors (5100235).

25501145 is an equidigital number, since it uses as much as digits as its factorization.

25501145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5100234.

The product of its (nonzero) digits is 1000, while the sum is 23.

The square root of 25501145 is about 5049.8658398021. The cubic root of 25501145 is about 294.3426712333.

Adding to 25501145 its reverse (54110552), we get a palindrome (79611697).

The spelling of 25501145 in words is "twenty-five million, five hundred one thousand, one hundred forty-five".