64481251 has 2 divisors, whose sum is σ = 64481252. Its totient is φ = 64481250.

The previous prime is 64481191. The next prime is 64481257. The reversal of 64481251 is 15218446.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64481251 - 2⁹ = 64480739 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (64481257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32240625 + 32240626.

It is an arithmetic number, because the mean of its divisors is an integer number (32240626).

Almost surely, 2^64481251 is an apocalyptic number.

64481251 is a deficient number, since it is larger than the sum of its proper divisors (1).

64481251 is an equidigital number, since it uses as much as digits as its factorization.

64481251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7680, while the sum is 31.

The square root of 64481251 is about 8030.0218555120. The cubic root of 64481251 is about 401.0001036478. Note that the first 3 decimals are identical.

Adding to 64481251 its reverse (15218446), we get a palindrome (79699697).

The spelling of 64481251 in words is "sixty-four million, four hundred eighty-one thousand, two hundred fifty-one".