25574821 has 2 divisors, whose sum is σ = 25574822. Its totient is φ = 25574820.

The previous prime is 25574767. The next prime is 25574831. The reversal of 25574821 is 12847552.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25100100 + 474721 = 5010^2 + 689^2 .

It is a cyclic number.

It is not a de Polignac number, because 25574821 - 2¹⁹ = 25050533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25574831) 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, 12787410 + 12787411.

It is an arithmetic number, because the mean of its divisors is an integer number (12787411).

Almost surely, 2^25574821 is an apocalyptic number.

It is an amenable number.

25574821 is a deficient number, since it is larger than the sum of its proper divisors (1).

25574821 is an equidigital number, since it uses as much as digits as its factorization.

25574821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22400, while the sum is 34.

The square root of 25574821 is about 5057.1554257310. The cubic root of 25574821 is about 294.6258629565.

It can be divided in two parts, 255 and 74821, that added together give a square (75076 = 274²).

The spelling of 25574821 in words is "twenty-five million, five hundred seventy-four thousand, eight hundred twenty-one".