3811951081 has 9 divisors (see below), whose sum is σ = 3949785541. Its totient is φ = 3678775744.

The previous prime is 3811951063. The next prime is 3811951103. The reversal of 3811951081 is 1801591183.

The square root of 3811951081 is 61741.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 204747481 + 3607203600 = 14309^2 + 60060^2 .

It is a de Polignac number, because none of the positive numbers 2^k-3811951081 is a prime.

It is a super-2 number, since 2×3811951081² = 29061942087874137122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3811951081.

It is not an unprimeable number, because it can be changed into a prime (3811951981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1789425 + ... + 1791553.

Almost surely, 2^3811951081 is an apocalyptic number.

3811951081 is the 61741-st square number.

3811951081 is the 30871-st centered octagonal number.

It is an amenable number.

3811951081 is a deficient number, since it is larger than the sum of its proper divisors (137834460).

3811951081 is an frugal number, since it uses more digits than its factorization.

3811951081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4316 (or 2158 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 37.

The cubic root of 3811951081 is about 1562.1249642492.

The spelling of 3811951081 in words is "three billion, eight hundred eleven million, nine hundred fifty-one thousand, eighty-one".