25497 has 6 divisors (see below), whose sum is σ = 36842. Its totient is φ = 16992.

The previous prime is 25471. The next prime is 25523. The reversal of 25497 is 79452.

It is an interprime number because it is at equal distance from previous prime (25471) and next prime (25523).

It can be written as a sum of positive squares in only one way, i.e., 20736 + 4761 = 144^2 + 69^2 .

It is not a de Polignac number, because 25497 - 2¹⁰ = 24473 is a prime.

It is a Duffinian number.

25497 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 25497.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25447) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1408 + ... + 1425.

2²⁵⁴⁹⁷ is an apocalyptic number.

It is an amenable number.

25497 is a deficient number, since it is larger than the sum of its proper divisors (11345).

25497 is a wasteful number, since it uses less digits than its factorization.

25497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2839 (or 2836 counting only the distinct ones).

The product of its digits is 2520, while the sum is 27.

The square root of 25497 is about 159.6778005861. The cubic root of 25497 is about 29.4326722714.

It can be divided in two parts, 2549 and 7, that added together give a triangular number (2556 = T₇₁).

The spelling of 25497 in words is "twenty-five thousand, four hundred ninety-seven".