3516721 has 6 divisors (see below), whose sum is σ = 3808230. Its totient is φ = 3246048.

The previous prime is 3516713. The next prime is 3516727. The reversal of 3516721 is 1276153.

3516721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 57121 + 3459600 = 239^2 + 1860^2 .

It is not a de Polignac number, because 3516721 - 2³ = 3516713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3516727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10236 + ... + 10573.

It is an arithmetic number, because the mean of its divisors is an integer number (634705).

Almost surely, 2^3516721 is an apocalyptic number.

It is an amenable number.

3516721 is a deficient number, since it is larger than the sum of its proper divisors (291509).

3516721 is a wasteful number, since it uses less digits than its factorization.

3516721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20835 (or 20822 counting only the distinct ones).

The product of its digits is 1260, while the sum is 25.

The square root of 3516721 is about 1875.2922438916. The cubic root of 3516721 is about 152.0708493579.

The spelling of 3516721 in words is "three million, five hundred sixteen thousand, seven hundred twenty-one".