1291192559 has 4 divisors (see below), whose sum is σ = 1292571504. Its totient is φ = 1289813616.

The previous prime is 1291192547. The next prime is 1291192583. The reversal of 1291192559 is 9552911921.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1291192559 - 2⁸ = 1291192303 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1291192759) 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 in 3 ways as a sum of consecutive naturals, for example, 688067 + ... + 689940.

It is an arithmetic number, because the mean of its divisors is an integer number (323142876).

Almost surely, 2^1291192559 is an apocalyptic number.

1291192559 is a deficient number, since it is larger than the sum of its proper divisors (1378945).

1291192559 is an equidigital number, since it uses as much as digits as its factorization.

1291192559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1378944.

The product of its digits is 72900, while the sum is 44.

The square root of 1291192559 is about 35933.1679510727. The cubic root of 1291192559 is about 1088.9225834943.

The spelling of 1291192559 in words is "one billion, two hundred ninety-one million, one hundred ninety-two thousand, five hundred fifty-nine".