64771897 has 2 divisors, whose sum is σ = 64771898. Its totient is φ = 64771896.

The previous prime is 64771879. The next prime is 64771901. The reversal of 64771897 is 79817746.

Together with previous prime (64771879) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56385081 + 8386816 = 7509^2 + 2896^2 .

It is a cyclic number.

It is not a de Polignac number, because 64771897 - 2⁷ = 64771769 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64771897.

It is not a weakly prime, because it can be changed into another prime (64771807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32385948 + 32385949.

It is an arithmetic number, because the mean of its divisors is an integer number (32385949).

Almost surely, 2^64771897 is an apocalyptic number.

It is an amenable number.

64771897 is a deficient number, since it is larger than the sum of its proper divisors (1).

64771897 is an equidigital number, since it uses as much as digits as its factorization.

64771897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 592704, while the sum is 49.

The square root of 64771897 is about 8048.0989680794. The cubic root of 64771897 is about 401.6016966094.

The spelling of 64771897 in words is "sixty-four million, seven hundred seventy-one thousand, eight hundred ninety-seven".