1291112371 has 2 divisors, whose sum is σ = 1291112372. Its totient is φ = 1291112370.

The previous prime is 1291112357. The next prime is 1291112401. The reversal of 1291112371 is 1732111921.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1291112371 - 2⁹ = 1291111859 is a prime.

It is not a weakly prime, because it can be changed into another prime (1291112071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 645556185 + 645556186.

It is an arithmetic number, because the mean of its divisors is an integer number (645556186).

Almost surely, 2^1291112371 is an apocalyptic number.

1291112371 is a deficient number, since it is larger than the sum of its proper divisors (1).

1291112371 is an equidigital number, since it uses as much as digits as its factorization.

1291112371 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 756, while the sum is 28.

The square root of 1291112371 is about 35932.0521401158. The cubic root of 1291112371 is about 1088.9000409408.

The spelling of 1291112371 in words is "one billion, two hundred ninety-one million, one hundred twelve thousand, three hundred seventy-one".