681421715 has 8 divisors (see below), whose sum is σ = 880606608. Its totient is φ = 503203680.

The previous prime is 681421709. The next prime is 681421733. The reversal of 681421715 is 517124186.

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

It is not a de Polignac number, because 681421715 - 2¹⁸ = 681159571 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5241641 + ... + 5241770.

It is an arithmetic number, because the mean of its divisors is an integer number (110075826).

Almost surely, 2^681421715 is an apocalyptic number.

681421715 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

681421715 is a deficient number, since it is larger than the sum of its proper divisors (199184893).

681421715 is a wasteful number, since it uses less digits than its factorization.

681421715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10483429.

The product of its digits is 13440, while the sum is 35.

The square root of 681421715 is about 26104.0555278294. The cubic root of 681421715 is about 879.9783547534.

The spelling of 681421715 in words is "six hundred eighty-one million, four hundred twenty-one thousand, seven hundred fifteen".