681291859 has 8 divisors (see below), whose sum is σ = 693202160. Its totient is φ = 669405600.

The previous prime is 681291857. The next prime is 681291869. The reversal of 681291859 is 958192186.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 681291859 - 2¹ = 681291857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681291857) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56812 + ... + 67750.

It is an arithmetic number, because the mean of its divisors is an integer number (86650270).

Almost surely, 2^681291859 is an apocalyptic number.

681291859 is a deficient number, since it is larger than the sum of its proper divisors (11910301).

681291859 is a wasteful number, since it uses less digits than its factorization.

681291859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12021.

The product of its digits is 311040, while the sum is 49.

The square root of 681291859 is about 26101.5681329686. The cubic root of 681291859 is about 879.9224531357.

The spelling of 681291859 in words is "six hundred eighty-one million, two hundred ninety-one thousand, eight hundred fifty-nine".