25717897 has 4 divisors (see below), whose sum is σ = 26043520. Its totient is φ = 25392276.

The previous prime is 25717877. The next prime is 25717903. The reversal of 25717897 is 79871752.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25717897 is a prime.

It is a super-2 number, since 2×25717897² = 1322820452205218, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25717837) 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, 162693 + ... + 162850.

It is an arithmetic number, because the mean of its divisors is an integer number (6510880).

Almost surely, 2^25717897 is an apocalyptic number.

It is an amenable number.

25717897 is a deficient number, since it is larger than the sum of its proper divisors (325623).

25717897 is an equidigital number, since it uses as much as digits as its factorization.

25717897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325622.

The product of its digits is 246960, while the sum is 46.

The square root of 25717897 is about 5071.2815934436. The cubic root of 25717897 is about 295.1742607300.

The spelling of 25717897 in words is "twenty-five million, seven hundred seventeen thousand, eight hundred ninety-seven".