25915121 has 2 divisors, whose sum is σ = 25915122. Its totient is φ = 25915120.

The previous prime is 25915117. The next prime is 25915139. The reversal of 25915121 is 12151952.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20830096 + 5085025 = 4564^2 + 2255^2 .

It is a cyclic number.

It is not a de Polignac number, because 25915121 - 2² = 25915117 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (25915151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12957560 + 12957561.

It is an arithmetic number, because the mean of its divisors is an integer number (12957561).

Almost surely, 2^25915121 is an apocalyptic number.

It is an amenable number.

25915121 is a deficient number, since it is larger than the sum of its proper divisors (1).

25915121 is an equidigital number, since it uses as much as digits as its factorization.

25915121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 900, while the sum is 26.

The square root of 25915121 is about 5090.6896389389. The cubic root of 25915121 is about 295.9268788521.

The spelling of 25915121 in words is "twenty-five million, nine hundred fifteen thousand, one hundred twenty-one".