1890808911811 has 4 divisors (see below), whose sum is σ = 1891506372624. Its totient is φ = 1890111451000.

The previous prime is 1890808911751. The next prime is 1890808911869. The reversal of 1890808911811 is 1181198080981.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1890808911811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1890808911311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 348726340 + ... + 348731761.

It is an arithmetic number, because the mean of its divisors is an integer number (472876593156).

Almost surely, 2^{1890808911811} is an apocalyptic number.

1890808911811 is a deficient number, since it is larger than the sum of its proper divisors (697460813).

1890808911811 is an equidigital number, since it uses as much as digits as its factorization.

1890808911811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 697460812.

The product of its (nonzero) digits is 331776, while the sum is 55.

The spelling of 1890808911811 in words is "one trillion, eight hundred ninety billion, eight hundred eight million, nine hundred eleven thousand, eight hundred eleven".