25717145 has 4 divisors (see below), whose sum is σ = 30860580. Its totient is φ = 20573712.

The previous prime is 25717121. The next prime is 25717147. The reversal of 25717145 is 54171752.

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 3936256 + 21780889 = 1984^2 + 4667^2 .

It is a cyclic number.

It is not a de Polignac number, because 25717145 - 2²⁰ = 24668569 is a prime.

It is a super-2 number, since 2×25717145² = 1322743093902050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25717147) by changing a digit.

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, 2571710 + ... + 2571719.

It is an arithmetic number, because the mean of its divisors is an integer number (7715145).

Almost surely, 2^25717145 is an apocalyptic number.

It is an amenable number.

25717145 is a deficient number, since it is larger than the sum of its proper divisors (5143435).

25717145 is an equidigital number, since it uses as much as digits as its factorization.

25717145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5143434.

The product of its digits is 9800, while the sum is 32.

The square root of 25717145 is about 5071.2074499078. The cubic root of 25717145 is about 295.1713837036.

Adding to 25717145 its reverse (54171752), we get a palindrome (79888897).

The spelling of 25717145 in words is "twenty-five million, seven hundred seventeen thousand, one hundred forty-five".