3689591681 has 8 divisors (see below), whose sum is σ = 3809347584. Its totient is φ = 3571253280.

The previous prime is 3689591677. The next prime is 3689591699. The reversal of 3689591681 is 1861959863.

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 3689591681 - 2² = 3689591677 is a prime.

It is a super-2 number, since 2×3689591681² = 27226173545008811522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3689591881) 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, 349085 + ... + 359498.

It is an arithmetic number, because the mean of its divisors is an integer number (476168448).

Almost surely, 2^3689591681 is an apocalyptic number.

It is an amenable number.

3689591681 is a deficient number, since it is larger than the sum of its proper divisors (119755903).

3689591681 is a wasteful number, since it uses less digits than its factorization.

3689591681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 708751.

The product of its digits is 2799360, while the sum is 56.

The square root of 3689591681 is about 60742.0091946258. The cubic root of 3689591681 is about 1545.2287105690.

The spelling of 3689591681 in words is "three billion, six hundred eighty-nine million, five hundred ninety-one thousand, six hundred eighty-one".