1090920191 has 4 divisors (see below), whose sum is σ = 1116290472. Its totient is φ = 1065549912.

The previous prime is 1090920167. The next prime is 1090920217. The reversal of 1090920191 is 1910290901.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1090920191 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 (1090920091) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12685076 + ... + 12685161.

It is an arithmetic number, because the mean of its divisors is an integer number (279072618).

Almost surely, 2^1090920191 is an apocalyptic number.

1090920191 is a deficient number, since it is larger than the sum of its proper divisors (25370281).

1090920191 is an equidigital number, since it uses as much as digits as its factorization.

1090920191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25370280.

The product of its (nonzero) digits is 1458, while the sum is 32.

The square root of 1090920191 is about 33029.0809893342. The cubic root of 1090920191 is about 1029.4319898953.

The spelling of 1090920191 in words is "one billion, ninety million, nine hundred twenty thousand, one hundred ninety-one".