681291839 has 8 divisors (see below), whose sum is σ = 696395232. Its totient is φ = 666271840.

The previous prime is 681291833. The next prime is 681291857. The reversal of 681291839 is 938192186.

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 681291839 - 2¹⁶ = 681226303 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 681291793 and 681291802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681291833) 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, 4184 + ... + 37149.

It is an arithmetic number, because the mean of its divisors is an integer number (87049404).

Almost surely, 2^681291839 is an apocalyptic number.

681291839 is a deficient number, since it is larger than the sum of its proper divisors (15103393).

681291839 is a wasteful number, since it uses less digits than its factorization.

681291839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41697.

The product of its digits is 186624, while the sum is 47.

The square root of 681291839 is about 26101.5677498498. The cubic root of 681291839 is about 879.9224445253.

The spelling of 681291839 in words is "six hundred eighty-one million, two hundred ninety-one thousand, eight hundred thirty-nine".