3531621 has 4 divisors (see below), whose sum is σ = 4708832. Its totient is φ = 2354412.

The previous prime is 3531601. The next prime is 3531623. The reversal of 3531621 is 1261353.

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.

It is not a de Polignac number, because 3531621 - 2⁹ = 3531109 is a prime.

It is a D-number.

It is a Duffinian number.

3531621 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3531623) 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 3 ways as a sum of consecutive naturals, for example, 588601 + ... + 588606.

It is an arithmetic number, because the mean of its divisors is an integer number (1177208).

Almost surely, 2^3531621 is an apocalyptic number.

It is an amenable number.

3531621 is a deficient number, since it is larger than the sum of its proper divisors (1177211).

3531621 is a wasteful number, since it uses less digits than its factorization.

3531621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1177210.

The product of its digits is 540, while the sum is 21.

The square root of 3531621 is about 1879.2607589156. The cubic root of 3531621 is about 152.2853164801.

Adding to 3531621 its reverse (1261353), we get a palindrome (4792974).

The spelling of 3531621 in words is "three million, five hundred thirty-one thousand, six hundred twenty-one".