25493521 has 2 divisors, whose sum is σ = 25493522. Its totient is φ = 25493520.

The previous prime is 25493519. The next prime is 25493527. The reversal of 25493521 is 12539452.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17313921 + 8179600 = 4161^2 + 2860^2 .

It is a cyclic number.

It is not a de Polignac number, because 25493521 - 2¹ = 25493519 is a prime.

It is a super-2 number, since 2×25493521² = 1299839225954882, which contains 22 as substring.

Together with 25493519, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (25493527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12746760 + 12746761.

It is an arithmetic number, because the mean of its divisors is an integer number (12746761).

Almost surely, 2^25493521 is an apocalyptic number.

It is an amenable number.

25493521 is a deficient number, since it is larger than the sum of its proper divisors (1).

25493521 is an equidigital number, since it uses as much as digits as its factorization.

25493521 is an evil number, because the sum of its binary digits is even.

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

The square root of 25493521 is about 5049.1109118339. The cubic root of 25493521 is about 294.3133353977.

The spelling of 25493521 in words is "twenty-five million, four hundred ninety-three thousand, five hundred twenty-one".