25624121 has 2 divisors, whose sum is σ = 25624122. Its totient is φ = 25624120.

The previous prime is 25624099. The next prime is 25624129. The reversal of 25624121 is 12142652.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22934521 + 2689600 = 4789^2 + 1640^2 .

It is a cyclic number.

It is not a de Polignac number, because 25624121 - 2²² = 21429817 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 (25624129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12812060 + 12812061.

It is an arithmetic number, because the mean of its divisors is an integer number (12812061).

Almost surely, 2^25624121 is an apocalyptic number.

It is an amenable number.

25624121 is a deficient number, since it is larger than the sum of its proper divisors (1).

25624121 is an equidigital number, since it uses as much as digits as its factorization.

25624121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 960, while the sum is 23.

The square root of 25624121 is about 5062.0273606530. The cubic root of 25624121 is about 294.8150559629.

Adding to 25624121 its reverse (12142652), we get a palindrome (37766773).

The spelling of 25624121 in words is "twenty-five million, six hundred twenty-four thousand, one hundred twenty-one".