3613091881 has 27 divisors (see below), whose sum is σ = 4358673207. Its totient is φ = 2986215120.

The previous prime is 3613091869. The next prime is 3613091897. The reversal of 3613091881 is 1881903163.

The square root of 3613091881 is 60109.

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

It can be written as a sum of positive squares in only one way, i.e., 622752025 + 2990339856 = 24955^2 + 54684^2 .

It is not a de Polignac number, because 3613091881 - 2⁵ = 3613091849 is a prime.

It is a super-2 number, since 2×3613091881² = 26108865881096236322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (3613091981) 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 26 ways as a sum of consecutive naturals, for example, 13043515 + ... + 13043791.

It is an arithmetic number, because the mean of its divisors is an integer number (161432341).

Almost surely, 2^3613091881 is an apocalyptic number.

3613091881 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

3613091881 is the 60109-th square number.

3613091881 is the 30055-th centered octagonal number.

It is an amenable number.

3613091881 is a deficient number, since it is larger than the sum of its proper divisors (745581326).

3613091881 is an frugal number, since it uses more digits than its factorization.

3613091881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 630 (or 315 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 40.

The cubic root of 3613091881 is about 1534.4744749691.

The spelling of 3613091881 in words is "three billion, six hundred thirteen million, ninety-one thousand, eight hundred eighty-one".