681193294 has 4 divisors (see below), whose sum is σ = 1021789944. Its totient is φ = 340596646.

The previous prime is 681193223. The next prime is 681193309. The reversal of 681193294 is 492391186.

It is a happy number.

681193294 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 681193294.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 170298322 + ... + 170298325.

It is an arithmetic number, because the mean of its divisors is an integer number (255447486).

Almost surely, 2^681193294 is an apocalyptic number.

681193294 is a deficient number, since it is larger than the sum of its proper divisors (340596650).

681193294 is a wasteful number, since it uses less digits than its factorization.

681193294 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340596649.

The product of its digits is 93312, while the sum is 43.

The square root of 681193294 is about 26099.6799597236. The cubic root of 681193294 is about 879.8800172162.

The spelling of 681193294 in words is "six hundred eighty-one million, one hundred ninety-three thousand, two hundred ninety-four".