1091071091 has 8 divisors (see below), whose sum is σ = 1212717744. Its totient is φ = 973167520.

The previous prime is 1091071063. The next prime is 1091071103. The reversal of 1091071091 is 1901701901.

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

It is a cyclic number.

It is not a de Polignac number, because 1091071091 - 2⁶ = 1091071027 is a prime.

It is a super-2 number, since 2×1091071091² = 2380872251231860562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1091071001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 935156 + ... + 936321.

It is an arithmetic number, because the mean of its divisors is an integer number (151589718).

Almost surely, 2^1091071091 is an apocalyptic number.

1091071091 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1091071091 is a deficient number, since it is larger than the sum of its proper divisors (121646653).

1091071091 is a wasteful number, since it uses less digits than its factorization.

1091071091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1871541.

The product of its (nonzero) digits is 567, while the sum is 29.

The square root of 1091071091 is about 33031.3652609153. The cubic root of 1091071091 is about 1029.4794526173.

Adding to 1091071091 its reverse (1901701901), we get a palindrome (2992772992).

The spelling of 1091071091 in words is "one billion, ninety-one million, seventy-one thousand, ninety-one".