25555801 has 2 divisors, whose sum is σ = 25555802. Its totient is φ = 25555800.

The previous prime is 25555793. The next prime is 25555819. The reversal of 25555801 is 10855552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23377225 + 2178576 = 4835^2 + 1476^2 .

It is a cyclic number.

It is not a de Polignac number, because 25555801 - 2³ = 25555793 is a prime.

It is not a weakly prime, because it can be changed into another prime (25555841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12777900 + 12777901.

It is an arithmetic number, because the mean of its divisors is an integer number (12777901).

Almost surely, 2^25555801 is an apocalyptic number.

It is an amenable number.

25555801 is a deficient number, since it is larger than the sum of its proper divisors (1).

25555801 is an equidigital number, since it uses as much as digits as its factorization.

25555801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10000, while the sum is 31.

The square root of 25555801 is about 5055.2745721672. The cubic root of 25555801 is about 294.5528070700.

The spelling of 25555801 in words is "twenty-five million, five hundred fifty-five thousand, eight hundred one".