25645513 has 2 divisors, whose sum is σ = 25645514. Its totient is φ = 25645512.

The previous prime is 25645511. The next prime is 25645531. The reversal of 25645513 is 31554652.

Together with next prime (25645531) 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., 19430464 + 6215049 = 4408^2 + 2493^2 .

It is a cyclic number.

It is not a de Polignac number, because 25645513 - 2¹ = 25645511 is a prime.

Together with 25645511, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (25645511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12822756 + 12822757.

It is an arithmetic number, because the mean of its divisors is an integer number (12822757).

Almost surely, 2^25645513 is an apocalyptic number.

It is an amenable number.

25645513 is a deficient number, since it is larger than the sum of its proper divisors (1).

25645513 is an equidigital number, since it uses as much as digits as its factorization.

25645513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18000, while the sum is 31.

The square root of 25645513 is about 5064.1399072301. The cubic root of 25645513 is about 294.8970741191.

It can be divided in two parts, 25645 and 513, that multiplied together give a triangular number (13155885 = T₅₁₂₉).

The spelling of 25645513 in words is "twenty-five million, six hundred forty-five thousand, five hundred thirteen".