1091661911 has 2 divisors, whose sum is σ = 1091661912. Its totient is φ = 1091661910.

The previous prime is 1091661889. The next prime is 1091661913. The reversal of 1091661911 is 1191661901.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1091661911 - 2¹⁰ = 1091660887 is a prime.

Together with 1091661913, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1091661913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 545830955 + 545830956.

It is an arithmetic number, because the mean of its divisors is an integer number (545830956).

Almost surely, 2^1091661911 is an apocalyptic number.

1091661911 is a deficient number, since it is larger than the sum of its proper divisors (1).

1091661911 is an equidigital number, since it uses as much as digits as its factorization.

1091661911 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2916, while the sum is 35.

The square root of 1091661911 is about 33040.3073684250. The cubic root of 1091661911 is about 1029.6652417012.

It can be divided in two parts, 10916 and 61911, that added together give a palindrome (72827).

The spelling of 1091661911 in words is "one billion, ninety-one million, six hundred sixty-one thousand, nine hundred eleven".