25150721 has 2 divisors, whose sum is σ = 25150722. Its totient is φ = 25150720.

The previous prime is 25150709. The next prime is 25150739. The reversal of 25150721 is 12705152.

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., 22137025 + 3013696 = 4705^2 + 1736^2 .

It is a cyclic number.

It is not a de Polignac number, because 25150721 - 2¹⁴ = 25134337 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25150751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12575360 + 12575361.

It is an arithmetic number, because the mean of its divisors is an integer number (12575361).

Almost surely, 2^25150721 is an apocalyptic number.

It is an amenable number.

25150721 is a deficient number, since it is larger than the sum of its proper divisors (1).

25150721 is an equidigital number, since it uses as much as digits as its factorization.

25150721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 700, while the sum is 23.

The square root of 25150721 is about 5015.0494514013. The cubic root of 25150721 is about 292.9882113861.

Adding to 25150721 its reverse (12705152), we get a palindrome (37855873).

The spelling of 25150721 in words is "twenty-five million, one hundred fifty thousand, seven hundred twenty-one".