1092001991 has 4 divisors (see below), whose sum is σ = 1149475800. Its totient is φ = 1034528184.

The previous prime is 1092001973. The next prime is 1092002011. The reversal of 1092001991 is 1991002901.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1991002901 = 257 ⋅7747093.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1092001991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1092001961) 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, 28736876 + ... + 28736913.

It is an arithmetic number, because the mean of its divisors is an integer number (287368950).

Almost surely, 2^1092001991 is an apocalyptic number.

1092001991 is a deficient number, since it is larger than the sum of its proper divisors (57473809).

1092001991 is an equidigital number, since it uses as much as digits as its factorization.

1092001991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57473808.

The product of its (nonzero) digits is 1458, while the sum is 32.

The square root of 1092001991 is about 33045.4534089033. The cubic root of 1092001991 is about 1029.7721527623.

The spelling of 1092001991 in words is "one billion, ninety-two million, one thousand, nine hundred ninety-one".