3611813261 has 8 divisors (see below), whose sum is σ = 4128909120. Its totient is φ = 3094998048.

The previous prime is 3611813221. The next prime is 3611813267. The reversal of 3611813261 is 1623181163.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3611813261 - 2¹⁸ = 3611551117 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3611813267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41816 + ... + 94721.

It is an arithmetic number, because the mean of its divisors is an integer number (516113640).

Almost surely, 2^3611813261 is an apocalyptic number.

It is an amenable number.

3611813261 is a deficient number, since it is larger than the sum of its proper divisors (517095859).

3611813261 is a wasteful number, since it uses less digits than its factorization.

3611813261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140323.

The product of its digits is 5184, while the sum is 32.

The square root of 3611813261 is about 60098.3632139845. The cubic root of 3611813261 is about 1534.2934443075.

The spelling of 3611813261 in words is "three billion, six hundred eleven million, eight hundred thirteen thousand, two hundred sixty-one".