65251243 has 2 divisors, whose sum is σ = 65251244. Its totient is φ = 65251242.

The previous prime is 65251237. The next prime is 65251261. The reversal of 65251243 is 34215256.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65251243 is a prime.

It is not a weakly prime, because it can be changed into another prime (65251223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32625621 + 32625622.

It is an arithmetic number, because the mean of its divisors is an integer number (32625622).

Almost surely, 2^65251243 is an apocalyptic number.

65251243 is a deficient number, since it is larger than the sum of its proper divisors (1).

65251243 is an equidigital number, since it uses as much as digits as its factorization.

65251243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7200, while the sum is 28.

The square root of 65251243 is about 8077.8241501038. The cubic root of 65251243 is about 402.5899504480.

Adding to 65251243 its reverse (34215256), we get a palindrome (99466499).

The spelling of 65251243 in words is "sixty-five million, two hundred fifty-one thousand, two hundred forty-three".