3531721 has 8 divisors (see below), whose sum is σ = 3636864. Its totient is φ = 3427920.

The previous prime is 3531713. The next prime is 3531727. The reversal of 3531721 is 1271353.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3531721 - 2³ = 3531713 is a prime.

It is a Duffinian number.

3531721 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 3531692 and 3531701.

It is not an unprimeable number, because it can be changed into a prime (3531727) 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 7 ways as a sum of consecutive naturals, for example, 7431 + ... + 7891.

It is an arithmetic number, because the mean of its divisors is an integer number (454608).

Almost surely, 2^3531721 is an apocalyptic number.

It is an amenable number.

3531721 is a deficient number, since it is larger than the sum of its proper divisors (105143).

3531721 is a wasteful number, since it uses less digits than its factorization.

3531721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 671.

The product of its digits is 630, while the sum is 22.

The square root of 3531721 is about 1879.2873649338. The cubic root of 3531721 is about 152.2867538170.

The spelling of 3531721 in words is "three million, five hundred thirty-one thousand, seven hundred twenty-one".