1231168091 has 2 divisors, whose sum is σ = 1231168092. Its totient is φ = 1231168090.

The previous prime is 1231168031. The next prime is 1231168121. The reversal of 1231168091 is 1908611321.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1231168091 - 2¹⁸ = 1230905947 is a prime.

It is not a weakly prime, because it can be changed into another prime (1231168031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615584045 + 615584046.

It is an arithmetic number, because the mean of its divisors is an integer number (615584046).

Almost surely, 2^1231168091 is an apocalyptic number.

1231168091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231168091 is an equidigital number, since it uses as much as digits as its factorization.

1231168091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 1231168091 is about 35088.0049447101. The cubic root of 1231168091 is about 1071.7803333576.

The spelling of 1231168091 in words is "one billion, two hundred thirty-one million, one hundred sixty-eight thousand, ninety-one".