64543397 has 2 divisors, whose sum is σ = 64543398. Its totient is φ = 64543396.

The previous prime is 64543337. The next prime is 64543433. The reversal of 64543397 is 79334546.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48011041 + 16532356 = 6929^2 + 4066^2 .

It is a cyclic number.

It is not a de Polignac number, because 64543397 - 2²⁴ = 47766181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64543327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32271698 + 32271699.

It is an arithmetic number, because the mean of its divisors is an integer number (32271699).

Almost surely, 2^64543397 is an apocalyptic number.

It is an amenable number.

64543397 is a deficient number, since it is larger than the sum of its proper divisors (1).

64543397 is an equidigital number, since it uses as much as digits as its factorization.

64543397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 272160, while the sum is 41.

The square root of 64543397 is about 8033.8905270112. The cubic root of 64543397 is about 401.1288881152.

The spelling of 64543397 in words is "sixty-four million, five hundred forty-three thousand, three hundred ninety-seven".