25917013 has 2 divisors, whose sum is σ = 25917014. Its totient is φ = 25917012.

The previous prime is 25917011. The next prime is 25917019. The reversal of 25917013 is 31071952.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15944049 + 9972964 = 3993^2 + 3158^2 .

It is a cyclic number.

It is not a de Polignac number, because 25917013 - 2¹ = 25917011 is a prime.

Together with 25917011, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25917011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12958506 + 12958507.

It is an arithmetic number, because the mean of its divisors is an integer number (12958507).

Almost surely, 2^25917013 is an apocalyptic number.

It is an amenable number.

25917013 is a deficient number, since it is larger than the sum of its proper divisors (1).

25917013 is an equidigital number, since it uses as much as digits as its factorization.

25917013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1890, while the sum is 28.

The square root of 25917013 is about 5090.8754649864. The cubic root of 25917013 is about 295.9340803109.

Adding to 25917013 its reverse (31071952), we get a palindrome (56988965).

It can be divided in two parts, 2591 and 7013, that added together give a square (9604 = 98²).

The spelling of 25917013 in words is "twenty-five million, nine hundred seventeen thousand, thirteen".