681404089 has 2 divisors, whose sum is σ = 681404090. Its totient is φ = 681404088.

The previous prime is 681404071. The next prime is 681404117. The reversal of 681404089 is 980404186.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 582739600 + 98664489 = 24140^2 + 9933^2 .

It is a cyclic number.

It is not a de Polignac number, because 681404089 - 2²³ = 673015481 is a prime.

It is not a weakly prime, because it can be changed into another prime (681404029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340702044 + 340702045.

It is an arithmetic number, because the mean of its divisors is an integer number (340702045).

Almost surely, 2^681404089 is an apocalyptic number.

It is an amenable number.

681404089 is a deficient number, since it is larger than the sum of its proper divisors (1).

681404089 is an equidigital number, since it uses as much as digits as its factorization.

681404089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 55296, while the sum is 40.

The square root of 681404089 is about 26103.7179152702. The cubic root of 681404089 is about 879.9707673657.

The spelling of 681404089 in words is "six hundred eighty-one million, four hundred four thousand, eighty-nine".