64771901 has 2 divisors, whose sum is σ = 64771902. Its totient is φ = 64771900.

The previous prime is 64771897. The next prime is 64771909. The reversal of 64771901 is 10917746.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33120025 + 31651876 = 5755^2 + 5626^2 .

It is a cyclic number.

It is not a de Polignac number, because 64771901 - 2² = 64771897 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64771909) 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, 32385950 + 32385951.

It is an arithmetic number, because the mean of its divisors is an integer number (32385951).

Almost surely, 2^64771901 is an apocalyptic number.

It is an amenable number.

64771901 is a deficient number, since it is larger than the sum of its proper divisors (1).

64771901 is an equidigital number, since it uses as much as digits as its factorization.

64771901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10584, while the sum is 35.

The square root of 64771901 is about 8048.0992165852. The cubic root of 64771901 is about 401.6017048764.

The spelling of 64771901 in words is "sixty-four million, seven hundred seventy-one thousand, nine hundred one".