3113721 has 20 divisors (see below), whose sum is σ = 5010852. Its totient is φ = 1915488.

The previous prime is 3113707. The next prime is 3113723. The reversal of 3113721 is 1273113.

It can be written as a sum of positive squares in 2 ways, for example, as 518400 + 2595321 = 720^2 + 1611^2 .

It is not a de Polignac number, because 3113721 - 2¹¹ = 3111673 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 3113694 and 3113703.

It is not an unprimeable number, because it can be changed into a prime (3113723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 426 + ... + 2531.

Almost surely, 2^3113721 is an apocalyptic number.

It is an amenable number.

3113721 is a deficient number, since it is larger than the sum of its proper divisors (1897131).

3113721 is a wasteful number, since it uses less digits than its factorization.

3113721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2982 (or 2973 counting only the distinct ones).

The product of its digits is 126, while the sum is 18.

The square root of 3113721 is about 1764.5738862400. The cubic root of 3113721 is about 146.0247815569.

Adding to 3113721 its reverse (1273113), we get a palindrome (4386834).

The spelling of 3113721 in words is "three million, one hundred thirteen thousand, seven hundred twenty-one".