1291185583 has 2 divisors, whose sum is σ = 1291185584. Its totient is φ = 1291185582.

The previous prime is 1291185541. The next prime is 1291185587. The reversal of 1291185583 is 3855811921.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1291185583 - 2²¹ = 1289088431 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1291185587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 645592791 + 645592792.

It is an arithmetic number, because the mean of its divisors is an integer number (645592792).

Almost surely, 2^1291185583 is an apocalyptic number.

1291185583 is a deficient number, since it is larger than the sum of its proper divisors (1).

1291185583 is an equidigital number, since it uses as much as digits as its factorization.

1291185583 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 86400, while the sum is 43.

The square root of 1291185583 is about 35933.0708818492. The cubic root of 1291185583 is about 1088.9206224293.

The spelling of 1291185583 in words is "one billion, two hundred ninety-one million, one hundred eighty-five thousand, five hundred eighty-three".