1808831813 has 2 divisors, whose sum is σ = 1808831814. Its totient is φ = 1808831812.

The previous prime is 1808831789. The next prime is 1808831821. The reversal of 1808831813 is 3181388081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1806420004 + 2411809 = 42502^2 + 1553^2 .

It is a cyclic number.

It is not a de Polignac number, because 1808831813 - 2²⁶ = 1741722949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1808831833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 904415906 + 904415907.

It is an arithmetic number, because the mean of its divisors is an integer number (904415907).

Almost surely, 2^1808831813 is an apocalyptic number.

It is an amenable number.

1808831813 is a deficient number, since it is larger than the sum of its proper divisors (1).

1808831813 is an equidigital number, since it uses as much as digits as its factorization.

1808831813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36864, while the sum is 41.

The square root of 1808831813 is about 42530.3634242643. The cubic root of 1808831813 is about 1218.4266677920.

The spelling of 1808831813 in words is "one billion, eight hundred eight million, eight hundred thirty-one thousand, eight hundred thirteen".