1156816091 has 2 divisors, whose sum is σ = 1156816092. Its totient is φ = 1156816090.

The previous prime is 1156816043. The next prime is 1156816099. The reversal of 1156816091 is 1906186511.

It is a strong prime.

It is an emirp because it is prime and its reverse (1906186511) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1156816091 - 2¹⁸ = 1156553947 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1156816099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 578408045 + 578408046.

It is an arithmetic number, because the mean of its divisors is an integer number (578408046).

Almost surely, 2^1156816091 is an apocalyptic number.

1156816091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1156816091 is an equidigital number, since it uses as much as digits as its factorization.

1156816091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 38.

The square root of 1156816091 is about 34011.9992208632. Note that the first 3 decimals coincide. The cubic root of 1156816091 is about 1049.7553749098.

The spelling of 1156816091 in words is "one billion, one hundred fifty-six million, eight hundred sixteen thousand, ninety-one".