864021293 has 2 divisors, whose sum is σ = 864021294. Its totient is φ = 864021292.

The previous prime is 864021287. The next prime is 864021307. The reversal of 864021293 is 392120468.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 814417444 + 49603849 = 28538^2 + 7043^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-864021293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (864021253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 432010646 + 432010647.

It is an arithmetic number, because the mean of its divisors is an integer number (432010647).

Almost surely, 2^864021293 is an apocalyptic number.

It is an amenable number.

864021293 is a deficient number, since it is larger than the sum of its proper divisors (1).

864021293 is an equidigital number, since it uses as much as digits as its factorization.

864021293 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 864021293 is about 29394.2391124519. The cubic root of 864021293 is about 952.4484553135.

The spelling of 864021293 in words is "eight hundred sixty-four million, twenty-one thousand, two hundred ninety-three".