3721631 has 2 divisors, whose sum is σ = 3721632. Its totient is φ = 3721630.

The previous prime is 3721621. The next prime is 3721673. The reversal of 3721631 is 1361273.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (1361273) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3721631 - 2¹⁸ = 3459487 is a prime.

It is a super-2 number, since 2×3721631² = 27701074600322, which contains 22 as substring.

It is a Chen prime.

It is an Ulam number.

It is equal to p₂₆₄₈₃₀ and since 3721631 and 264830 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 3721597 and 3721606.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3721621) 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 as a sum of consecutive naturals, namely, 1860815 + 1860816.

It is an arithmetic number, because the mean of its divisors is an integer number (1860816).

Almost surely, 2^3721631 is an apocalyptic number.

3721631 is a deficient number, since it is larger than the sum of its proper divisors (1).

3721631 is an equidigital number, since it uses as much as digits as its factorization.

3721631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 756, while the sum is 23.

The square root of 3721631 is about 1929.1529229172. The cubic root of 3721631 is about 154.9688595089.

The spelling of 3721631 in words is "three million, seven hundred twenty-one thousand, six hundred thirty-one".