3613261681 has 4 divisors (see below), whose sum is σ = 3618035572. Its totient is φ = 3608487792.

The previous prime is 3613261679. The next prime is 3613261741. The reversal of 3613261681 is 1861623163.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1348358400 + 2264903281 = 36720^2 + 47591^2 .

It is a cyclic number.

It is not a de Polignac number, because 3613261681 - 2¹ = 3613261679 is a prime.

It is a super-2 number, since 2×3613261681² = 26111319950765891522, 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 3613261681.

It is not an unprimeable number, because it can be changed into a prime (3613261621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2385810 + ... + 2387323.

It is an arithmetic number, because the mean of its divisors is an integer number (904508893).

Almost surely, 2^3613261681 is an apocalyptic number.

It is an amenable number.

3613261681 is a deficient number, since it is larger than the sum of its proper divisors (4773891).

3613261681 is an equidigital number, since it uses as much as digits as its factorization.

3613261681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4773890.

The product of its digits is 31104, while the sum is 37.

The square root of 3613261681 is about 60110.4124174839. The cubic root of 3613261681 is about 1534.4985125241.

The spelling of 3613261681 in words is "three billion, six hundred thirteen million, two hundred sixty-one thousand, six hundred eighty-one".