3181813 has 2 divisors, whose sum is σ = 3181814. Its totient is φ = 3181812.

The previous prime is 3181781. The next prime is 3181823.

3181813 is nontrivially palindromic in base 10.

3181813 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2331729 + 850084 = 1527^2 + 922^2 .

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 3181813 - 2⁵ = 3181781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3181823) 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 as a sum of consecutive naturals, namely, 1590906 + 1590907.

It is an arithmetic number, because the mean of its divisors is an integer number (1590907).

Almost surely, 2^3181813 is an apocalyptic number.

It is an amenable number.

3181813 is a deficient number, since it is larger than the sum of its proper divisors (1).

3181813 is an equidigital number, since it uses as much as digits as its factorization.

3181813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 576, while the sum is 25.

The square root of 3181813 is about 1783.7637175366. The cubic root of 3181813 is about 147.0815565453.

The spelling of 3181813 in words is "three million, one hundred eighty-one thousand, eight hundred thirteen".