1091261859 has 8 divisors (see below), whose sum is σ = 1455170640. Its totient is φ = 727430496.

The previous prime is 1091261849. The next prime is 1091261881. The reversal of 1091261859 is 9581621901.

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

It is a de Polignac number, because none of the positive numbers 2^k-1091261859 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1091261859.

It is not an unprimeable number, because it can be changed into a prime (1091261849) 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, 36889 + ... + 59525.

It is an arithmetic number, because the mean of its divisors is an integer number (181896330).

Almost surely, 2^1091261859 is an apocalyptic number.

1091261859 is a deficient number, since it is larger than the sum of its proper divisors (363908781).

1091261859 is a wasteful number, since it uses less digits than its factorization.

1091261859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38709.

The product of its (nonzero) digits is 38880, while the sum is 42.

The square root of 1091261859 is about 33034.2528143138. The cubic root of 1091261859 is about 1029.5394487969.

It can be divided in two parts, 10912 and 61859, that added together give a triangular number (72771 = T₃₈₁).

The spelling of 1091261859 in words is "one billion, ninety-one million, two hundred sixty-one thousand, eight hundred fifty-nine".