25591061 has 2 divisors, whose sum is σ = 25591062. Its totient is φ = 25591060.

The previous prime is 25591057. The next prime is 25591091. The reversal of 25591061 is 16019552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23716900 + 1874161 = 4870^2 + 1369^2 .

It is a cyclic number.

It is not a de Polignac number, because 25591061 - 2² = 25591057 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25591031) 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, 12795530 + 12795531.

It is an arithmetic number, because the mean of its divisors is an integer number (12795531).

Almost surely, 2^25591061 is an apocalyptic number.

It is an amenable number.

25591061 is a deficient number, since it is larger than the sum of its proper divisors (1).

25591061 is an equidigital number, since it uses as much as digits as its factorization.

25591061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2700, while the sum is 29.

The square root of 25591061 is about 5058.7608166427. The cubic root of 25591061 is about 294.6882121919.

The spelling of 25591061 in words is "twenty-five million, five hundred ninety-one thousand, sixty-one".