1083812991 has 16 divisors (see below), whose sum is σ = 1562256000. Its totient is φ = 666011808.

The previous prime is 1083812987. The next prime is 1083812993. The reversal of 1083812991 is 1992183801.

1083812991 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1083812991 - 2² = 1083812987 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1083812993) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 254841 + ... + 259058.

It is an arithmetic number, because the mean of its divisors is an integer number (97641000).

Almost surely, 2^1083812991 is an apocalyptic number.

1083812991 is a deficient number, since it is larger than the sum of its proper divisors (478443009).

1083812991 is a wasteful number, since it uses less digits than its factorization.

1083812991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 513958.

The product of its (nonzero) digits is 31104, while the sum is 42.

The square root of 1083812991 is about 32921.3151468771. The cubic root of 1083812991 is about 1027.1915799892.

The spelling of 1083812991 in words is "one billion, eighty-three million, eight hundred twelve thousand, nine hundred ninety-one".