3631813 has 2 divisors, whose sum is σ = 3631814. Its totient is φ = 3631812.

The previous prime is 3631811. The next prime is 3631841. The reversal of 3631813 is 3181363.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3621409 + 10404 = 1903^2 + 102^2 .

It is a cyclic number.

It is not a de Polignac number, because 3631813 - 2¹ = 3631811 is a prime.

Together with 3631811, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3631811) 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, 1815906 + 1815907.

It is an arithmetic number, because the mean of its divisors is an integer number (1815907).

Almost surely, 2^3631813 is an apocalyptic number.

It is an amenable number.

3631813 is a deficient number, since it is larger than the sum of its proper divisors (1).

3631813 is an equidigital number, since it uses as much as digits as its factorization.

3631813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 25.

The square root of 3631813 is about 1905.7316180407. The cubic root of 3631813 is about 153.7120187319.

It can be divided in two parts, 3631 and 813, that added together give a palindrome (4444).

The spelling of 3631813 in words is "three million, six hundred thirty-one thousand, eight hundred thirteen".