25121513 has 2 divisors, whose sum is σ = 25121514. Its totient is φ = 25121512.

The previous prime is 25121507. The next prime is 25121519. The reversal of 25121513 is 31512152.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (25121507) and next prime (25121519).

It can be written as a sum of positive squares in only one way, i.e., 25120144 + 1369 = 5012^2 + 37^2 .

It is a cyclic number.

It is not a de Polignac number, because 25121513 - 2¹⁸ = 24859369 is a prime.

It is equal to p_1573121 and since 25121513 and 1573121 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (25121519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12560756 + 12560757.

It is an arithmetic number, because the mean of its divisors is an integer number (12560757).

Almost surely, 2^25121513 is an apocalyptic number.

It is an amenable number.

25121513 is a deficient number, since it is larger than the sum of its proper divisors (1).

25121513 is an equidigital number, since it uses as much as digits as its factorization.

25121513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 300, while the sum is 20.

The square root of 25121513 is about 5012.1365703660. The cubic root of 25121513 is about 292.8747499003.

Adding to 25121513 its reverse (31512152), we get a palindrome (56633665).

The spelling of 25121513 in words is "twenty-five million, one hundred twenty-one thousand, five hundred thirteen".