25521493 has 2 divisors, whose sum is σ = 25521494. Its totient is φ = 25521492.

The previous prime is 25521491. The next prime is 25521497. The reversal of 25521493 is 39412552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25472209 + 49284 = 5047^2 + 222^2 .

It is a cyclic number.

It is not a de Polignac number, because 25521493 - 2¹ = 25521491 is a prime.

Together with 25521491, it forms a pair of twin primes.

It is equal to p_1596406 and since 25521493 and 1596406 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25521491) 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, 12760746 + 12760747.

It is an arithmetic number, because the mean of its divisors is an integer number (12760747).

Almost surely, 2^25521493 is an apocalyptic number.

It is an amenable number.

25521493 is a deficient number, since it is larger than the sum of its proper divisors (1).

25521493 is an equidigital number, since it uses as much as digits as its factorization.

25521493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10800, while the sum is 31.

The square root of 25521493 is about 5051.8801450549. The cubic root of 25521493 is about 294.4209382076.

The spelling of 25521493 in words is "twenty-five million, five hundred twenty-one thousand, four hundred ninety-three".