1143312091 has 2 divisors, whose sum is σ = 1143312092. Its totient is φ = 1143312090.

The previous prime is 1143312047. The next prime is 1143312109. The reversal of 1143312091 is 1902133411.

Together with next prime (1143312109) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1143312091 is a prime.

It is not a weakly prime, because it can be changed into another prime (1143312011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 571656045 + 571656046.

It is an arithmetic number, because the mean of its divisors is an integer number (571656046).

Almost surely, 2^1143312091 is an apocalyptic number.

1143312091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1143312091 is an equidigital number, since it uses as much as digits as its factorization.

1143312091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 1143312091 is about 33812.8982934028. The cubic root of 1143312091 is about 1045.6546316060.

The spelling of 1143312091 in words is "one billion, one hundred forty-three million, three hundred twelve thousand, ninety-one".