25518497 has 2 divisors, whose sum is σ = 25518498. Its totient is φ = 25518496.

The previous prime is 25518473. The next prime is 25518499. The reversal of 25518497 is 79481552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15124321 + 10394176 = 3889^2 + 3224^2 .

It is a cyclic number.

It is not a de Polignac number, because 25518497 - 2¹⁰ = 25517473 is a prime.

Together with 25518499, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25518499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12759248 + 12759249.

It is an arithmetic number, because the mean of its divisors is an integer number (12759249).

Almost surely, 2^25518497 is an apocalyptic number.

It is an amenable number.

25518497 is a deficient number, since it is larger than the sum of its proper divisors (1).

25518497 is an equidigital number, since it uses as much as digits as its factorization.

25518497 is an evil number, because the sum of its binary digits is even.

The product of its digits is 100800, while the sum is 41.

The square root of 25518497 is about 5051.5836130861. The cubic root of 25518497 is about 294.4094169426.

The spelling of 25518497 in words is "twenty-five million, five hundred eighteen thousand, four hundred ninety-seven".