25603121 has 2 divisors, whose sum is σ = 25603122. Its totient is φ = 25603120.

The previous prime is 25603091. The next prime is 25603133. The reversal of 25603121 is 12130652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25391521 + 211600 = 5039^2 + 460^2 .

It is a cyclic number.

It is not a de Polignac number, because 25603121 - 2¹⁸ = 25340977 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25603093 and 25603102.

It is not a weakly prime, because it can be changed into another prime (25603321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12801560 + 12801561.

It is an arithmetic number, because the mean of its divisors is an integer number (12801561).

Almost surely, 2^25603121 is an apocalyptic number.

It is an amenable number.

25603121 is a deficient number, since it is larger than the sum of its proper divisors (1).

25603121 is an equidigital number, since it uses as much as digits as its factorization.

25603121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 25603121 is about 5059.9526677628. The cubic root of 25603121 is about 294.7344963444.

Adding to 25603121 its reverse (12130652), we get a palindrome (37733773).

The spelling of 25603121 in words is "twenty-five million, six hundred three thousand, one hundred twenty-one".