25215601 has 2 divisors, whose sum is σ = 25215602. Its totient is φ = 25215600.

The previous prime is 25215581. The next prime is 25215647. The reversal of 25215601 is 10651252.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17007376 + 8208225 = 4124^2 + 2865^2 .

It is a cyclic number.

It is not a de Polignac number, because 25215601 - 2⁷ = 25215473 is a prime.

It is not a weakly prime, because it can be changed into another prime (25215661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12607800 + 12607801.

It is an arithmetic number, because the mean of its divisors is an integer number (12607801).

Almost surely, 2^25215601 is an apocalyptic number.

It is an amenable number.

25215601 is a deficient number, since it is larger than the sum of its proper divisors (1).

25215601 is an equidigital number, since it uses as much as digits as its factorization.

25215601 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 25215601 is about 5021.5138155739. The cubic root of 25215601 is about 293.2399305179.

Adding to 25215601 its reverse (10651252), we get a palindrome (35866853).

The spelling of 25215601 in words is "twenty-five million, two hundred fifteen thousand, six hundred one".