681290833 has 2 divisors, whose sum is σ = 681290834. Its totient is φ = 681290832.

The previous prime is 681290821. The next prime is 681290851. The reversal of 681290833 is 338092186.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 562306369 + 118984464 = 23713^2 + 10908^2 .

It is a cyclic number.

It is not a de Polignac number, because 681290833 - 2²¹ = 679193681 is a prime.

It is not a weakly prime, because it can be changed into another prime (681290873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340645416 + 340645417.

It is an arithmetic number, because the mean of its divisors is an integer number (340645417).

Almost surely, 2^681290833 is an apocalyptic number.

It is an amenable number.

681290833 is a deficient number, since it is larger than the sum of its proper divisors (1).

681290833 is an equidigital number, since it uses as much as digits as its factorization.

681290833 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 681290833 is about 26101.5484789696. The cubic root of 681290833 is about 879.9220114254.

The spelling of 681290833 in words is "six hundred eighty-one million, two hundred ninety thousand, eight hundred thirty-three".