3521631 has 16 divisors (see below), whose sum is σ = 5104640. Its totient is φ = 2151360.

The previous prime is 3521627. The next prime is 3521633. The reversal of 3521631 is 1361253.

It is not a de Polignac number, because 3521631 - 2² = 3521627 is a prime.

It is a super-2 number, since 2×3521631² = 24803769800322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3521598 and 3521607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3521633) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 771 + ... + 2763.

It is an arithmetic number, because the mean of its divisors is an integer number (319040).

Almost surely, 2^3521631 is an apocalyptic number.

3521631 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

3521631 is a deficient number, since it is larger than the sum of its proper divisors (1583009).

3521631 is a wasteful number, since it uses less digits than its factorization.

3521631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2046.

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

The square root of 3521631 is about 1876.6009165510. The cubic root of 3521631 is about 152.1415895582.

Adding to 3521631 its reverse (1361253), we get a palindrome (4882884).

The spelling of 3521631 in words is "three million, five hundred twenty-one thousand, six hundred thirty-one".