25521061 has 2 divisors, whose sum is σ = 25521062. Its totient is φ = 25521060.

The previous prime is 25521049. The next prime is 25521071. The reversal of 25521061 is 16012552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18792225 + 6728836 = 4335^2 + 2594^2 .

It is a cyclic number.

It is not a de Polignac number, because 25521061 - 2¹⁷ = 25389989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25521011) 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, 12760530 + 12760531.

It is an arithmetic number, because the mean of its divisors is an integer number (12760531).

Almost surely, 2^25521061 is an apocalyptic number.

It is an amenable number.

25521061 is a deficient number, since it is larger than the sum of its proper divisors (1).

25521061 is an equidigital number, since it uses as much as digits as its factorization.

25521061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 25521061 is about 5051.8373885152. The cubic root of 25521061 is about 294.4192769861.

It can be divided in two parts, 255 and 21061, that added together give a square (21316 = 146²).

The spelling of 25521061 in words is "twenty-five million, five hundred twenty-one thousand, sixty-one".