25513729 has 2 divisors, whose sum is σ = 25513730. Its totient is φ = 25513728.

The previous prime is 25513727. The next prime is 25513819. The reversal of 25513729 is 92731552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14938225 + 10575504 = 3865^2 + 3252^2 .

It is a cyclic number.

It is not a de Polignac number, because 25513729 - 2¹ = 25513727 is a prime.

Together with 25513727, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 25513694 and 25513703.

It is not a weakly prime, because it can be changed into another prime (25513727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12756864 + 12756865.

It is an arithmetic number, because the mean of its divisors is an integer number (12756865).

Almost surely, 2^25513729 is an apocalyptic number.

It is an amenable number.

25513729 is a deficient number, since it is larger than the sum of its proper divisors (1).

25513729 is an equidigital number, since it uses as much as digits as its factorization.

25513729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18900, while the sum is 34.

The square root of 25513729 is about 5051.1116598230. Note that the first 3 decimals coincide. The cubic root of 25513729 is about 294.3910795051.

The spelling of 25513729 in words is "twenty-five million, five hundred thirteen thousand, seven hundred twenty-nine".