5681613221 has 4 divisors (see below), whose sum is σ = 5681943744. Its totient is φ = 5681282700.

The previous prime is 5681613209. The next prime is 5681613233. The reversal of 5681613221 is 1223161865.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1223161865 = 5 ⋅244632373.

It is an interprime number because it is at equal distance from previous prime (5681613209) and next prime (5681613233).

It is a cyclic number.

It is not a de Polignac number, because 5681613221 - 2²² = 5677418917 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5681613281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 137975 + ... + 174356.

It is an arithmetic number, because the mean of its divisors is an integer number (1420485936).

Almost surely, 2^5681613221 is an apocalyptic number.

It is an amenable number.

5681613221 is a deficient number, since it is larger than the sum of its proper divisors (330523).

5681613221 is a wasteful number, since it uses less digits than its factorization.

5681613221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330522.

The product of its digits is 17280, while the sum is 35.

The square root of 5681613221 is about 75376.4765759186. The cubic root of 5681613221 is about 1784.3931820427.

The spelling of 5681613221 in words is "five billion, six hundred eighty-one million, six hundred thirteen thousand, two hundred twenty-one".