1155312091 has 2 divisors, whose sum is σ = 1155312092. Its totient is φ = 1155312090.

The previous prime is 1155312077. The next prime is 1155312097. The reversal of 1155312091 is 1902135511.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1155312091 - 2⁹ = 1155311579 is a prime.

It is a super-2 number, since 2×1155312091² = 2669492055221584562, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1155312097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 577656045 + 577656046.

It is an arithmetic number, because the mean of its divisors is an integer number (577656046).

Almost surely, 2^1155312091 is an apocalyptic number.

1155312091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1155312091 is an equidigital number, since it uses as much as digits as its factorization.

1155312091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1350, while the sum is 28.

The square root of 1155312091 is about 33989.8821857329. The cubic root of 1155312091 is about 1049.3002415443.

The spelling of 1155312091 in words is "one billion, one hundred fifty-five million, three hundred twelve thousand, ninety-one".