25424989 has 2 divisors, whose sum is σ = 25424990. Its totient is φ = 25424988.

The previous prime is 25424977. The next prime is 25425007. The reversal of 25424989 is 98942452.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15920100 + 9504889 = 3990^2 + 3083^2 .

It is a cyclic number.

It is not a de Polignac number, because 25424989 - 2¹⁵ = 25392221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25424969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12712494 + 12712495.

It is an arithmetic number, because the mean of its divisors is an integer number (12712495).

Almost surely, 2^25424989 is an apocalyptic number.

It is an amenable number.

25424989 is a deficient number, since it is larger than the sum of its proper divisors (1).

25424989 is an equidigital number, since it uses as much as digits as its factorization.

25424989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 207360, while the sum is 43.

The square root of 25424989 is about 5042.3198034238. The cubic root of 25424989 is about 294.0493731386.

The spelling of 25424989 in words is "twenty-five million, four hundred twenty-four thousand, nine hundred eighty-nine".