25243513 has 2 divisors, whose sum is σ = 25243514. Its totient is φ = 25243512.

The previous prime is 25243507. The next prime is 25243531. The reversal of 25243513 is 31534252.

Together with next prime (25243531) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24720784 + 522729 = 4972^2 + 723^2 .

It is a cyclic number.

It is not a de Polignac number, because 25243513 - 2⁵ = 25243481 is a prime.

It is not a weakly prime, because it can be changed into another prime (25243573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12621756 + 12621757.

It is an arithmetic number, because the mean of its divisors is an integer number (12621757).

Almost surely, 2^25243513 is an apocalyptic number.

It is an amenable number.

25243513 is a deficient number, since it is larger than the sum of its proper divisors (1).

25243513 is an equidigital number, since it uses as much as digits as its factorization.

25243513 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3600, while the sum is 25.

The square root of 25243513 is about 5024.2922884721. The cubic root of 25243513 is about 293.3480896789.

Adding to 25243513 its reverse (31534252), we get a palindrome (56777765).

The spelling of 25243513 in words is "twenty-five million, two hundred forty-three thousand, five hundred thirteen".