1820109191011 has 2 divisors, whose sum is σ = 1820109191012. Its totient is φ = 1820109191010.

The previous prime is 1820109190969. The next prime is 1820109191023. The reversal of 1820109191011 is 1101919010281.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1820109191011 - 2²⁷ = 1819974973283 is a prime.

It is not a weakly prime, because it can be changed into another prime (1820109191611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 910054595505 + 910054595506.

It is an arithmetic number, because the mean of its divisors is an integer number (910054595506).

Almost surely, 2^{1820109191011} is an apocalyptic number.

1820109191011 is a deficient number, since it is larger than the sum of its proper divisors (1).

1820109191011 is an equidigital number, since it uses as much as digits as its factorization.

1820109191011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 34.

The spelling of 1820109191011 in words is "one trillion, eight hundred twenty billion, one hundred nine million, one hundred ninety-one thousand, eleven".