1100020091 has 4 divisors (see below), whose sum is σ = 1100150184. Its totient is φ = 1099890000.

The previous prime is 1100020087. The next prime is 1100020093. The reversal of 1100020091 is 1900200011.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1100020091 - 2² = 1100020087 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1100020093) 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, 51410 + ... + 69591.

It is an arithmetic number, because the mean of its divisors is an integer number (275037546).

Almost surely, 2^1100020091 is an apocalyptic number.

1100020091 is a deficient number, since it is larger than the sum of its proper divisors (130093).

1100020091 is an equidigital number, since it uses as much as digits as its factorization.

1100020091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130092.

The product of its (nonzero) digits is 18, while the sum is 14.

The square root of 1100020091 is about 33166.5507853922. The cubic root of 1100020091 is about 1032.2864001271.

The spelling of 1100020091 in words is "one billion, one hundred million, twenty thousand, ninety-one".