1116388891 has 2 divisors, whose sum is σ = 1116388892. Its totient is φ = 1116388890.

The previous prime is 1116388799. The next prime is 1116388939. The reversal of 1116388891 is 1988836111.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1116388891 - 2¹⁵ = 1116356123 is a prime.

It is not a weakly prime, because it can be changed into another prime (1116388291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 558194445 + 558194446.

It is an arithmetic number, because the mean of its divisors is an integer number (558194446).

Almost surely, 2^1116388891 is an apocalyptic number.

1116388891 is a deficient number, since it is larger than the sum of its proper divisors (1).

1116388891 is an equidigital number, since it uses as much as digits as its factorization.

1116388891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 82944, while the sum is 46.

The square root of 1116388891 is about 33412.4062437891. The cubic root of 1116388891 is about 1037.3815078495.

The spelling of 1116388891 in words is "one billion, one hundred sixteen million, three hundred eighty-eight thousand, eight hundred ninety-one".