25531013 has 2 divisors, whose sum is σ = 25531014. Its totient is φ = 25531012.

The previous prime is 25530997. The next prime is 25531019. The reversal of 25531013 is 31013552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21836929 + 3694084 = 4673^2 + 1922^2 .

It is a cyclic number.

It is not a de Polignac number, because 25531013 - 2⁴ = 25530997 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 (25531019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12765506 + 12765507.

It is an arithmetic number, because the mean of its divisors is an integer number (12765507).

Almost surely, 2^25531013 is an apocalyptic number.

It is an amenable number.

25531013 is a deficient number, since it is larger than the sum of its proper divisors (1).

25531013 is an equidigital number, since it uses as much as digits as its factorization.

25531013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 450, while the sum is 20.

The square root of 25531013 is about 5052.8222806665. The cubic root of 25531013 is about 294.4575418511.

Adding to 25531013 its reverse (31013552), we get a palindrome (56544565).

The spelling of 25531013 in words is "twenty-five million, five hundred thirty-one thousand, thirteen".