25321613 has 2 divisors, whose sum is σ = 25321614. Its totient is φ = 25321612.

The previous prime is 25321603. The next prime is 25321663. The reversal of 25321613 is 31612352.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21409129 + 3912484 = 4627^2 + 1978^2 .

It is a cyclic number.

It is not a de Polignac number, because 25321613 - 2¹⁸ = 25059469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25321603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12660806 + 12660807.

It is an arithmetic number, because the mean of its divisors is an integer number (12660807).

Almost surely, 2^25321613 is an apocalyptic number.

It is an amenable number.

25321613 is a deficient number, since it is larger than the sum of its proper divisors (1).

25321613 is an equidigital number, since it uses as much as digits as its factorization.

25321613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1080, while the sum is 23.

The square root of 25321613 is about 5032.0585250969. The cubic root of 25321613 is about 293.6503046020.

Adding to 25321613 its reverse (31612352), we get a palindrome (56933965).

The spelling of 25321613 in words is "twenty-five million, three hundred twenty-one thousand, six hundred thirteen".