64506251 has 2 divisors, whose sum is σ = 64506252. Its totient is φ = 64506250.

The previous prime is 64506227. The next prime is 64506289. The reversal of 64506251 is 15260546.

64506251 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64506251 - 2⁶ = 64506187 is a prime.

It is a super-2 number, since 2×64506251² = 8322112836150002, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (64506151) 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, 32253125 + 32253126.

It is an arithmetic number, because the mean of its divisors is an integer number (32253126).

Almost surely, 2^64506251 is an apocalyptic number.

64506251 is a deficient number, since it is larger than the sum of its proper divisors (1).

64506251 is an equidigital number, since it uses as much as digits as its factorization.

64506251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 64506251 is about 8031.5783629371. The cubic root of 64506251 is about 401.0519208149.

Adding to 64506251 its reverse (15260546), we get a palindrome (79766797).

The spelling of 64506251 in words is "sixty-four million, five hundred six thousand, two hundred fifty-one".