864721433 has 2 divisors, whose sum is σ = 864721434. Its totient is φ = 864721432.

The previous prime is 864721411. The next prime is 864721477. The reversal of 864721433 is 334127468.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 859486489 + 5234944 = 29317^2 + 2288^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-864721433 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (861721433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 432360716 + 432360717.

It is an arithmetic number, because the mean of its divisors is an integer number (432360717).

Almost surely, 2^864721433 is an apocalyptic number.

It is an amenable number.

864721433 is a deficient number, since it is larger than the sum of its proper divisors (1).

864721433 is an equidigital number, since it uses as much as digits as its factorization.

864721433 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96768, while the sum is 38.

The square root of 864721433 is about 29406.1461772875. The cubic root of 864721433 is about 952.7056508350.

The spelling of 864721433 in words is "eight hundred sixty-four million, seven hundred twenty-one thousand, four hundred thirty-three".