1101009991 has 8 divisors (see below), whose sum is σ = 1111999104. Its totient is φ = 1090034040.

The previous prime is 1101009979. The next prime is 1101009997. The reversal of 1101009991 is 1999001011.

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 1101009991 - 2¹⁹ = 1100485703 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 (1101009997) 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, 298086 + ... + 301756.

It is an arithmetic number, because the mean of its divisors is an integer number (138999888).

Almost surely, 2^1101009991 is an apocalyptic number.

1101009991 is a deficient number, since it is larger than the sum of its proper divisors (10989113).

1101009991 is a wasteful number, since it uses less digits than its factorization.

1101009991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6581.

The product of its (nonzero) digits is 729, while the sum is 31.

The square root of 1101009991 is about 33181.4705973078. The cubic root of 1101009991 is about 1032.5959562730.

It can be divided in two parts, 110 and 1009991, that added together give a palindrome (1010101).

The spelling of 1101009991 in words is "one billion, one hundred one million, nine thousand, nine hundred ninety-one".