3813661791 has 32 divisors (see below), whose sum is σ = 5890867200. Its totient is φ = 2435378400.

The previous prime is 3813661777. The next prime is 3813661823. The reversal of 3813661791 is 1971663183.

It is not a de Polignac number, because 3813661791 - 2¹¹ = 3813659743 is a prime.

It is a super-2 number, since 2×3813661791² = 29088032512266655362, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3813661711) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 80266 + ... + 118616.

It is an arithmetic number, because the mean of its divisors is an integer number (184089600).

Almost surely, 2^3813661791 is an apocalyptic number.

3813661791 is a deficient number, since it is larger than the sum of its proper divisors (2077205409).

3813661791 is a wasteful number, since it uses less digits than its factorization.

3813661791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38516 (or 38510 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The square root of 3813661791 is about 61754.8523680528. The cubic root of 3813661791 is about 1562.3586104040.

The spelling of 3813661791 in words is "three billion, eight hundred thirteen million, six hundred sixty-one thousand, seven hundred ninety-one".