1069916891 has 2 divisors, whose sum is σ = 1069916892. Its totient is φ = 1069916890.

The previous prime is 1069916873. The next prime is 1069916893. The reversal of 1069916891 is 1986199601.

It is a strong prime.

It is an emirp because it is prime and its reverse (1986199601) is a distict prime. It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 1689166901 and 1096619861.

It is a cyclic number.

It is not a de Polignac number, because 1069916891 - 2²² = 1065722587 is a prime.

It is a super-2 number, since 2×1069916891² = 2289444307294211762, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 1069916893, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1069916893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 534958445 + 534958446.

It is an arithmetic number, because the mean of its divisors is an integer number (534958446).

Almost surely, 2^1069916891 is an apocalyptic number.

1069916891 is a deficient number, since it is larger than the sum of its proper divisors (1).

1069916891 is an equidigital number, since it uses as much as digits as its factorization.

1069916891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 209952, while the sum is 50.

The square root of 1069916891 is about 32709.5840847908. The cubic root of 1069916891 is about 1022.7826398867.

The spelling of 1069916891 in words is "one billion, sixty-nine million, nine hundred sixteen thousand, eight hundred ninety-one".