25775021 has 2 divisors, whose sum is σ = 25775022. Its totient is φ = 25775020.

The previous prime is 25775011. The next prime is 25775033. The reversal of 25775021 is 12057752.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22221796 + 3553225 = 4714^2 + 1885^2 .

It is a cyclic number.

It is not a de Polignac number, because 25775021 - 2²² = 21580717 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25775011) 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, 12887510 + 12887511.

It is an arithmetic number, because the mean of its divisors is an integer number (12887511).

Almost surely, 2^25775021 is an apocalyptic number.

It is an amenable number.

25775021 is a deficient number, since it is larger than the sum of its proper divisors (1).

25775021 is an equidigital number, since it uses as much as digits as its factorization.

25775021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4900, while the sum is 29.

The square root of 25775021 is about 5076.9105763249. The cubic root of 25775021 is about 295.3926438752.

The spelling of 25775021 in words is "twenty-five million, seven hundred seventy-five thousand, twenty-one".