3688612261 has 4 divisors (see below), whose sum is σ = 3688984332. Its totient is φ = 3688240192.

The previous prime is 3688612243. The next prime is 3688612267. The reversal of 3688612261 is 1622168863.

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 3314189761 + 374422500 = 57569^2 + 19350^2 .

It is a cyclic number.

It is not a de Polignac number, because 3688612261 - 2²⁷ = 3554394533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3688612267) 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 3 ways as a sum of consecutive naturals, for example, 170746 + ... + 191131.

It is an arithmetic number, because the mean of its divisors is an integer number (922246083).

Almost surely, 2^3688612261 is an apocalyptic number.

It is an amenable number.

3688612261 is a deficient number, since it is larger than the sum of its proper divisors (372071).

3688612261 is a wasteful number, since it uses less digits than its factorization.

3688612261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 372070.

The product of its digits is 165888, while the sum is 43.

The square root of 3688612261 is about 60733.9465291035. The cubic root of 3688612261 is about 1545.0919689844.

The spelling of 3688612261 in words is "three billion, six hundred eighty-eight million, six hundred twelve thousand, two hundred sixty-one".