64543517 has 2 divisors, whose sum is σ = 64543518. Its totient is φ = 64543516.

The previous prime is 64543511. The next prime is 64543529. The reversal of 64543517 is 71534546.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61371556 + 3171961 = 7834^2 + 1781^2 .

It is a cyclic number.

It is not a de Polignac number, because 64543517 - 2⁸ = 64543261 is a prime.

It is a Chen prime.

It is a zygodrome in base 3.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64543511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32271758 + 32271759.

It is an arithmetic number, because the mean of its divisors is an integer number (32271759).

Almost surely, 2^64543517 is an apocalyptic number.

It is an amenable number.

64543517 is a deficient number, since it is larger than the sum of its proper divisors (1).

64543517 is an equidigital number, since it uses as much as digits as its factorization.

64543517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 50400, while the sum is 35.

The square root of 64543517 is about 8033.8979953694. The cubic root of 64543517 is about 401.1291367099.

The spelling of 64543517 in words is "sixty-four million, five hundred forty-three thousand, five hundred seventeen".