1813801819 has 2 divisors, whose sum is σ = 1813801820. Its totient is φ = 1813801818.

The previous prime is 1813801799. The next prime is 1813801837. The reversal of 1813801819 is 9181083181.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1813801819 - 2²⁵ = 1780247387 is a prime.

It is a super-2 number, since 2×1813801819² = 6579754077215417522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1813801889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 906900909 + 906900910.

It is an arithmetic number, because the mean of its divisors is an integer number (906900910).

Almost surely, 2^1813801819 is an apocalyptic number.

1813801819 is a deficient number, since it is larger than the sum of its proper divisors (1).

1813801819 is an equidigital number, since it uses as much as digits as its factorization.

1813801819 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 40.

The square root of 1813801819 is about 42588.7522592527. The cubic root of 1813801819 is about 1219.5415770719.

The spelling of 1813801819 in words is "one billion, eight hundred thirteen million, eight hundred one thousand, eight hundred nineteen".