681581092 has 6 divisors (see below), whose sum is σ = 1192766918. Its totient is φ = 340790544.

The previous prime is 681581081. The next prime is 681581099. The reversal of 681581092 is 290185186.

It can be written as a sum of positive squares in only one way, i.e., 642318336 + 39262756 = 25344^2 + 6266^2 .

It is not an unprimeable number, because it can be changed into a prime (681581099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85197633 + ... + 85197640.

Almost surely, 2^681581092 is an apocalyptic number.

It is an amenable number.

681581092 is a deficient number, since it is larger than the sum of its proper divisors (511185826).

681581092 is a wasteful number, since it uses less digits than its factorization.

681581092 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170395277 (or 170395275 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 40.

The square root of 681581092 is about 26107.1080742391. The cubic root of 681581092 is about 880.0469551391.

The spelling of 681581092 in words is "six hundred eighty-one million, five hundred eighty-one thousand, ninety-two".