3220731361 has 4 divisors (see below), whose sum is σ = 3221510292. Its totient is φ = 3219952432.

The previous prime is 3220731337. The next prime is 3220731373. The reversal of 3220731361 is 1631370223.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1631370223 = 7 ⋅233052889.

It can be written as a sum of positive squares in 2 ways, for example, as 1358291025 + 1862440336 = 36855^2 + 43156^2 .

It is a cyclic number.

It is not a de Polignac number, because 3220731361 - 2⁷ = 3220731233 is a prime.

It is a super-2 number, since 2×3220731361² = 20746220999457824642, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3220731461) 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, 383230 + ... + 391543.

It is an arithmetic number, because the mean of its divisors is an integer number (805377573).

Almost surely, 2^3220731361 is an apocalyptic number.

It is an amenable number.

3220731361 is a deficient number, since it is larger than the sum of its proper divisors (778931).

3220731361 is an equidigital number, since it uses as much as digits as its factorization.

3220731361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 778930.

The product of its (nonzero) digits is 4536, while the sum is 28.

The square root of 3220731361 is about 56751.4877426134. The cubic root of 3220731361 is about 1476.7880429954.

The spelling of 3220731361 in words is "three billion, two hundred twenty million, seven hundred thirty-one thousand, three hundred sixty-one".