1083491991 has 32 divisors (see below), whose sum is σ = 1713070080. Its totient is φ = 674448768.

The previous prime is 1083491977. The next prime is 1083492083. The reversal of 1083491991 is 1991943801.

It is not a de Polignac number, because 1083491991 - 2⁷ = 1083491863 is a prime.

It is a super-2 number, since 2×1083491991² = 2347909789122288162, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1083491911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 49000 + ... + 67586.

It is an arithmetic number, because the mean of its divisors is an integer number (53533440).

Almost surely, 2^1083491991 is an apocalyptic number.

1083491991 is a deficient number, since it is larger than the sum of its proper divisors (629578089).

1083491991 is a wasteful number, since it uses less digits than its factorization.

1083491991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18740 (or 18734 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 45.

The square root of 1083491991 is about 32916.4395249547. The cubic root of 1083491991 is about 1027.0901599540.

The spelling of 1083491991 in words is "one billion, eighty-three million, four hundred ninety-one thousand, nine hundred ninety-one".