800045681 has 2 divisors, whose sum is σ = 800045682. Its totient is φ = 800045680.

The previous prime is 800045671. The next prime is 800045693. The reversal of 800045681 is 186540008.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 606390625 + 193655056 = 24625^2 + 13916^2 .

It is a cyclic number.

It is not a de Polignac number, because 800045681 - 2¹⁰ = 800044657 is a prime.

It is a super-2 number, since 2×800045681² = 1280146183373507522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (800045671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 400022840 + 400022841.

It is an arithmetic number, because the mean of its divisors is an integer number (400022841).

Almost surely, 2^800045681 is an apocalyptic number.

It is an amenable number.

800045681 is a deficient number, since it is larger than the sum of its proper divisors (1).

800045681 is an equidigital number, since it uses as much as digits as its factorization.

800045681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7680, while the sum is 32.

The square root of 800045681 is about 28285.0787695562. The cubic root of 800045681 is about 928.3354357545.

Adding to 800045681 its reverse (186540008), we get a palindrome (986585689).

The spelling of 800045681 in words is "eight hundred million, forty-five thousand, six hundred eighty-one".