25581013 has 2 divisors, whose sum is σ = 25581014. Its totient is φ = 25581012.

The previous prime is 25580981. The next prime is 25581067. The reversal of 25581013 is 31018552.

It is a happy number.

25581013 is nontrivially palindromic in base 14.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25180324 + 400689 = 5018^2 + 633^2 .

It is a cyclic number.

It is not a de Polignac number, because 25581013 - 2⁵ = 25580981 is a prime.

It is a super-2 number, since 2×25581013² = 1308776452212338, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25581613) 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, 12790506 + 12790507.

It is an arithmetic number, because the mean of its divisors is an integer number (12790507).

Almost surely, 2^25581013 is an apocalyptic number.

It is an amenable number.

25581013 is a deficient number, since it is larger than the sum of its proper divisors (1).

25581013 is an equidigital number, since it uses as much as digits as its factorization.

25581013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 25581013 is about 5057.7675905482. The cubic root of 25581013 is about 294.6496386346.

Adding to 25581013 its reverse (31018552), we get a palindrome (56599565).

The spelling of 25581013 in words is "twenty-five million, five hundred eighty-one thousand, thirteen".