681479135 has 8 divisors (see below), whose sum is σ = 839877216. Its totient is φ = 530448480.

The previous prime is 681479083. The next prime is 681479159. The reversal of 681479135 is 531974186.

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

It is not a de Polignac number, because 681479135 - 2¹⁴ = 681462751 is a prime.

It is a super-2 number, since 2×681479135² = 928827622880696450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent 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, 1841651 + ... + 1842020.

It is an arithmetic number, because the mean of its divisors is an integer number (104984652).

Almost surely, 2^681479135 is an apocalyptic number.

681479135 is a deficient number, since it is larger than the sum of its proper divisors (158398081).

681479135 is a wasteful number, since it uses less digits than its factorization.

681479135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3683713.

The product of its digits is 181440, while the sum is 44.

The square root of 681479135 is about 26105.1553337650. The cubic root of 681479135 is about 880.0030711842.

The spelling of 681479135 in words is "six hundred eighty-one million, four hundred seventy-nine thousand, one hundred thirty-five".