3809159681 has 4 divisors (see below), whose sum is σ = 3823981572. Its totient is φ = 3794337792.

The previous prime is 3809159663. The next prime is 3809159693. The reversal of 3809159681 is 1869519083.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1869519083 = 1381 ⋅1353743.

It can be written as a sum of positive squares in 2 ways, for example, as 3350557456 + 458602225 = 57884^2 + 21415^2 .

It is a cyclic number.

It is not a de Polignac number, because 3809159681 - 2⁶ = 3809159617 is a prime.

It is a super-2 number, since 2×3809159681² = 29019394950712043522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3809159381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7410560 + ... + 7411073.

It is an arithmetic number, because the mean of its divisors is an integer number (955995393).

Almost surely, 2^3809159681 is an apocalyptic number.

It is an amenable number.

3809159681 is a deficient number, since it is larger than the sum of its proper divisors (14821891).

3809159681 is a wasteful number, since it uses less digits than its factorization.

3809159681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14821890.

The product of its (nonzero) digits is 466560, while the sum is 50.

The square root of 3809159681 is about 61718.3901361661. The cubic root of 3809159681 is about 1561.7435689714.

The spelling of 3809159681 in words is "three billion, eight hundred nine million, one hundred fifty-nine thousand, six hundred eighty-one".