1090191005 has 4 divisors (see below), whose sum is σ = 1308229212. Its totient is φ = 872152800.

The previous prime is 1090191001. The next prime is 1090191023. The reversal of 1090191005 is 5001910901.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 520843684 + 569347321 = 22822^2 + 23861^2 .

It is not a de Polignac number, because 1090191005 - 2² = 1090191001 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1090191001) 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 in 3 ways as a sum of consecutive naturals, for example, 109019096 + ... + 109019105.

It is an arithmetic number, because the mean of its divisors is an integer number (327057303).

Almost surely, 2^1090191005 is an apocalyptic number.

It is an amenable number.

1090191005 is a deficient number, since it is larger than the sum of its proper divisors (218038207).

1090191005 is an equidigital number, since it uses as much as digits as its factorization.

1090191005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218038206.

The product of its (nonzero) digits is 405, while the sum is 26.

The square root of 1090191005 is about 33018.0405990422. The cubic root of 1090191005 is about 1029.2025766253.

The spelling of 1090191005 in words is "one billion, ninety million, one hundred ninety-one thousand, five".