1091930291 has 4 divisors (see below), whose sum is σ = 1102741584. Its totient is φ = 1081119000.

The previous prime is 1091930269. The next prime is 1091930293. The reversal of 1091930291 is 1920391901.

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 1091930291 - 2⁶ = 1091930227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1091930293) 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, 5405495 + ... + 5405696.

It is an arithmetic number, because the mean of its divisors is an integer number (275685396).

Almost surely, 2^1091930291 is an apocalyptic number.

1091930291 is a deficient number, since it is larger than the sum of its proper divisors (10811293).

1091930291 is a wasteful number, since it uses less digits than its factorization.

1091930291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10811292.

The product of its (nonzero) digits is 4374, while the sum is 35.

The square root of 1091930291 is about 33044.3685217315. The cubic root of 1091930291 is about 1029.7496142565.

The spelling of 1091930291 in words is "one billion, ninety-one million, nine hundred thirty thousand, two hundred ninety-one".