25317147 has 4 divisors (see below), whose sum is σ = 33756200. Its totient is φ = 16878096.

The previous prime is 25317143. The next prime is 25317167. The reversal of 25317147 is 74171352.

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

It is not a de Polignac number, because 25317147 - 2² = 25317143 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25317143) 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, 4219522 + ... + 4219527.

It is an arithmetic number, because the mean of its divisors is an integer number (8439050).

Almost surely, 2^25317147 is an apocalyptic number.

25317147 is a deficient number, since it is larger than the sum of its proper divisors (8439053).

25317147 is an equidigital number, since it uses as much as digits as its factorization.

25317147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8439052.

The product of its digits is 5880, while the sum is 30.

The square root of 25317147 is about 5031.6147507535. The cubic root of 25317147 is about 293.6330397808.

Adding to 25317147 its reverse (74171352), we get a palindrome (99488499).

The spelling of 25317147 in words is "twenty-five million, three hundred seventeen thousand, one hundred forty-seven".