1209055591 has 8 divisors (see below), whose sum is σ = 1221675984. Its totient is φ = 1196469120.

The previous prime is 1209055571. The next prime is 1209055613. The reversal of 1209055591 is 1955509021.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1209055591 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1209055591.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1209055511) 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 in 7 ways as a sum of consecutive naturals, for example, 66600 + ... + 82786.

It is an arithmetic number, because the mean of its divisors is an integer number (152709498).

Almost surely, 2^1209055591 is an apocalyptic number.

1209055591 is a deficient number, since it is larger than the sum of its proper divisors (12620393).

1209055591 is a wasteful number, since it uses less digits than its factorization.

1209055591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16961.

The product of its (nonzero) digits is 20250, while the sum is 37.

The square root of 1209055591 is about 34771.4766870779. The cubic root of 1209055591 is about 1065.3249292515.

The spelling of 1209055591 in words is "one billion, two hundred nine million, fifty-five thousand, five hundred ninety-one".