1081066891 has 4 divisors (see below), whose sum is σ = 1093213800. Its totient is φ = 1068919984.

The previous prime is 1081066879. The next prime is 1081066897. The reversal of 1081066891 is 1986601801.

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-1081066891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1081066897) 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, 6073321 + ... + 6073498.

It is an arithmetic number, because the mean of its divisors is an integer number (273303450).

Almost surely, 2^1081066891 is an apocalyptic number.

1081066891 is a deficient number, since it is larger than the sum of its proper divisors (12146909).

1081066891 is an equidigital number, since it uses as much as digits as its factorization.

1081066891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12146908.

The product of its (nonzero) digits is 20736, while the sum is 40.

The square root of 1081066891 is about 32879.5816731296. The cubic root of 1081066891 is about 1026.3233008837.

The spelling of 1081066891 in words is "one billion, eighty-one million, sixty-six thousand, eight hundred ninety-one".