1891068911 has 2 divisors, whose sum is σ = 1891068912. Its totient is φ = 1891068910.

The previous prime is 1891068863. The next prime is 1891068931. The reversal of 1891068911 is 1198601981.

It is a strong prime.

It is an emirp because it is prime and its reverse (1198601981) is a distict prime. It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 1168901681 and 1861098611.

It is a cyclic number.

It is not a de Polignac number, because 1891068911 - 2⁶ = 1891068847 is a prime.

It is a super-2 number, since 2×1891068911² = 7152283252301451842, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1891068931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 945534455 + 945534456.

It is an arithmetic number, because the mean of its divisors is an integer number (945534456).

Almost surely, 2^1891068911 is an apocalyptic number.

1891068911 is a deficient number, since it is larger than the sum of its proper divisors (1).

1891068911 is an equidigital number, since it uses as much as digits as its factorization.

1891068911 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 44.

The square root of 1891068911 is about 43486.4221453088. The cubic root of 1891068911 is about 1236.6186299936.

The spelling of 1891068911 in words is "one billion, eight hundred ninety-one million, sixty-eight thousand, nine hundred eleven".