2087191811 has 2 divisors, whose sum is σ = 2087191812. Its totient is φ = 2087191810.

The previous prime is 2087191807. The next prime is 2087191829. The reversal of 2087191811 is 1181917802.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2087191811 - 2² = 2087191807 is a prime.

It is not a weakly prime, because it can be changed into another prime (2087191831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1043595905 + 1043595906.

It is an arithmetic number, because the mean of its divisors is an integer number (1043595906).

Almost surely, 2^2087191811 is an apocalyptic number.

2087191811 is a deficient number, since it is larger than the sum of its proper divisors (1).

2087191811 is an equidigital number, since it uses as much as digits as its factorization.

2087191811 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 38.

The square root of 2087191811 is about 45685.7944113923. The cubic root of 2087191811 is about 1277.9703778065.

The spelling of 2087191811 in words is "two billion, eighty-seven million, one hundred ninety-one thousand, eight hundred eleven".