25548421 has 2 divisors, whose sum is σ = 25548422. Its totient is φ = 25548420.

The previous prime is 25548409. The next prime is 25548431. The reversal of 25548421 is 12484552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19228225 + 6320196 = 4385^2 + 2514^2 .

It is a cyclic number.

It is not a de Polignac number, because 25548421 - 2¹⁷ = 25417349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25548431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12774210 + 12774211.

It is an arithmetic number, because the mean of its divisors is an integer number (12774211).

Almost surely, 2^25548421 is an apocalyptic number.

It is an amenable number.

25548421 is a deficient number, since it is larger than the sum of its proper divisors (1).

25548421 is an equidigital number, since it uses as much as digits as its factorization.

25548421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12800, while the sum is 31.

The square root of 25548421 is about 5054.5445887834. The cubic root of 25548421 is about 294.5244507032.

The spelling of 25548421 in words is "twenty-five million, five hundred forty-eight thousand, four hundred twenty-one".