64971329 has 2 divisors, whose sum is σ = 64971330. Its totient is φ = 64971328.

The previous prime is 64971299. The next prime is 64971337. The reversal of 64971329 is 92317946.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36881329 + 28090000 = 6073^2 + 5300^2 .

It is a cyclic number.

It is not a de Polignac number, because 64971329 - 2⁸ = 64971073 is a prime.

It is not a weakly prime, because it can be changed into another prime (64971359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32485664 + 32485665.

It is an arithmetic number, because the mean of its divisors is an integer number (32485665).

Almost surely, 2^64971329 is an apocalyptic number.

It is an amenable number.

64971329 is a deficient number, since it is larger than the sum of its proper divisors (1).

64971329 is an equidigital number, since it uses as much as digits as its factorization.

64971329 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 41.

The square root of 64971329 is about 8060.4794522410. The cubic root of 64971329 is about 402.0134501246.

The spelling of 64971329 in words is "sixty-four million, nine hundred seventy-one thousand, three hundred twenty-nine".