681443582 has 4 divisors (see below), whose sum is σ = 1022165376. Its totient is φ = 340721790.

The previous prime is 681443579. The next prime is 681443593. The reversal of 681443582 is 285344186.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 285344186 = 2 ⋅142672093.

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, 170360894 + ... + 170360897.

It is an arithmetic number, because the mean of its divisors is an integer number (255541344).

Almost surely, 2^681443582 is an apocalyptic number.

681443582 is a deficient number, since it is larger than the sum of its proper divisors (340721794).

681443582 is a wasteful number, since it uses less digits than its factorization.

681443582 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340721793.

The product of its digits is 184320, while the sum is 41.

The square root of 681443582 is about 26104.4743674336. The cubic root of 681443582 is about 879.9877675641.

The spelling of 681443582 in words is "six hundred eighty-one million, four hundred forty-three thousand, five hundred eighty-two".