25071247 has 4 divisors (see below), whose sum is σ = 25123216. Its totient is φ = 25019280.

The previous prime is 25071223. The next prime is 25071251. The reversal of 25071247 is 74217052.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25071247 is a prime.

It is a super-2 number, since 2×25071247² = 1257134852270018, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25071217) 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, 25254 + ... + 26227.

It is an arithmetic number, because the mean of its divisors is an integer number (6280804).

Almost surely, 2^25071247 is an apocalyptic number.

25071247 is a deficient number, since it is larger than the sum of its proper divisors (51969).

25071247 is an equidigital number, since it uses as much as digits as its factorization.

25071247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51968.

The product of its (nonzero) digits is 3920, while the sum is 28.

The square root of 25071247 is about 5007.1196310853. The cubic root of 25071247 is about 292.6792803570.

Adding to 25071247 its reverse (74217052), we get a palindrome (99288299).

The spelling of 25071247 in words is "twenty-five million, seventy-one thousand, two hundred forty-seven".