1091861011 has 8 divisors (see below), whose sum is σ = 1166482880. Its totient is φ = 1018954728.

The previous prime is 1091860997. The next prime is 1091861033. The reversal of 1091861011 is 1101681901.

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 1091861011 - 2⁷ = 1091860883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1091861041) 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, 427581 + ... + 430126.

It is an arithmetic number, because the mean of its divisors is an integer number (145810360).

Almost surely, 2^1091861011 is an apocalyptic number.

1091861011 is a deficient number, since it is larger than the sum of its proper divisors (74621869).

1091861011 is an equidigital number, since it uses as much as digits as its factorization.

1091861011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 857793.

The product of its (nonzero) digits is 432, while the sum is 28.

The square root of 1091861011 is about 33043.3202175568. The cubic root of 1091861011 is about 1029.7278355274.

The spelling of 1091861011 in words is "one billion, ninety-one million, eight hundred sixty-one thousand, eleven".