1061108891 has 4 divisors (see below), whose sum is σ = 1061339784. Its totient is φ = 1060878000.

The previous prime is 1061108879. The next prime is 1061108897. The reversal of 1061108891 is 1988011601.

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-1061108891 is a prime.

It is a super-2 number, since 2×1061108891² = 2251904157118499762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1061108897) 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, 108410 + ... + 117791.

It is an arithmetic number, because the mean of its divisors is an integer number (265334946).

Almost surely, 2^1061108891 is an apocalyptic number.

1061108891 is a deficient number, since it is larger than the sum of its proper divisors (230893).

1061108891 is an equidigital number, since it uses as much as digits as its factorization.

1061108891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230892.

The product of its (nonzero) digits is 3456, while the sum is 35.

The square root of 1061108891 is about 32574.6663989058. Note that the first 3 decimals coincide. The cubic root of 1061108891 is about 1019.9682455192.

The spelling of 1061108891 in words is "one billion, sixty-one million, one hundred eight thousand, eight hundred ninety-one".