25228921 has 2 divisors, whose sum is σ = 25228922. Its totient is φ = 25228920.

The previous prime is 25228913. The next prime is 25228937. The reversal of 25228921 is 12982252.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14100025 + 11128896 = 3755^2 + 3336^2 .

It is a cyclic number.

It is not a de Polignac number, because 25228921 - 2³ = 25228913 is a prime.

It is not a weakly prime, because it can be changed into another prime (25228321) 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, 12614460 + 12614461.

It is an arithmetic number, because the mean of its divisors is an integer number (12614461).

Almost surely, 2^25228921 is an apocalyptic number.

It is an amenable number.

25228921 is a deficient number, since it is larger than the sum of its proper divisors (1).

25228921 is an equidigital number, since it uses as much as digits as its factorization.

25228921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5760, while the sum is 31.

The square root of 25228921 is about 5022.8399337427. The cubic root of 25228921 is about 293.2915555457.

The spelling of 25228921 in words is "twenty-five million, two hundred twenty-eight thousand, nine hundred twenty-one".