25248721 has 2 divisors, whose sum is σ = 25248722. Its totient is φ = 25248720.

The previous prime is 25248679. The next prime is 25248731. The reversal of 25248721 is 12784252.

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., 22137025 + 3111696 = 4705^2 + 1764^2 .

It is a cyclic number.

It is not a de Polignac number, because 25248721 - 2⁷ = 25248593 is a prime.

It is not a weakly prime, because it can be changed into another prime (25248731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12624360 + 12624361.

It is an arithmetic number, because the mean of its divisors is an integer number (12624361).

Almost surely, 2^25248721 is an apocalyptic number.

It is an amenable number.

25248721 is a deficient number, since it is larger than the sum of its proper divisors (1).

25248721 is an equidigital number, since it uses as much as digits as its factorization.

25248721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8960, while the sum is 31.

The square root of 25248721 is about 5024.8105436922. The cubic root of 25248721 is about 293.3682618818.

The spelling of 25248721 in words is "twenty-five million, two hundred forty-eight thousand, seven hundred twenty-one".