25449145 has 4 divisors (see below), whose sum is σ = 30538980. Its totient is φ = 20359312.

The previous prime is 25449133. The next prime is 25449157. The reversal of 25449145 is 54194452.

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

It is an interprime number because it is at equal distance from previous prime (25449133) and next prime (25449157).

It can be written as a sum of positive squares in 2 ways, for example, as 4682896 + 20766249 = 2164^2 + 4557^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25449145 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25449145.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2544910 + ... + 2544919.

It is an arithmetic number, because the mean of its divisors is an integer number (7634745).

Almost surely, 2^25449145 is an apocalyptic number.

It is an amenable number.

25449145 is a deficient number, since it is larger than the sum of its proper divisors (5089835).

25449145 is an equidigital number, since it uses as much as digits as its factorization.

25449145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5089834.

The product of its digits is 28800, while the sum is 34.

The square root of 25449145 is about 5044.7145608052. The cubic root of 25449145 is about 294.1424680112.

The spelling of 25449145 in words is "twenty-five million, four hundred forty-nine thousand, one hundred forty-five".