3213631 has 4 divisors (see below), whose sum is σ = 3221064. Its totient is φ = 3206200.

The previous prime is 3213619. The next prime is 3213659. The reversal of 3213631 is 1363123.

3213631 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1363123 = 359 ⋅3797.

It is a cyclic number.

It is not a de Polignac number, because 3213631 - 2⁵ = 3213599 is a prime.

It is a super-2 number, since 2×3213631² = 20654848408322, which contains 22 as substring.

It is a Duffinian number.

3213631 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 3213599 and 3213608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3213131) 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 3 ways as a sum of consecutive naturals, for example, 3025 + ... + 3946.

It is an arithmetic number, because the mean of its divisors is an integer number (805266).

Almost surely, 2^3213631 is an apocalyptic number.

3213631 is a deficient number, since it is larger than the sum of its proper divisors (7433).

3213631 is an equidigital number, since it uses as much as digits as its factorization.

3213631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7432.

The product of its digits is 324, while the sum is 19.

The square root of 3213631 is about 1792.6603136121. The cubic root of 3213631 is about 147.5702011900.

Adding to 3213631 its reverse (1363123), we get a palindrome (4576754).

It can be divided in two parts, 3213 and 631, that added together give a square (3844 = 62²).

The spelling of 3213631 in words is "three million, two hundred thirteen thousand, six hundred thirty-one".