1111001023 has 4 divisors (see below), whose sum is σ = 1212001128. Its totient is φ = 1010000920.

The previous prime is 1111000997. The next prime is 1111001027. The reversal of 1111001023 is 3201001111.

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 1111001023 - 2⁹ = 1111000511 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 (1111001027) 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, 50500036 + ... + 50500057.

It is an arithmetic number, because the mean of its divisors is an integer number (303000282).

Almost surely, 2^1111001023 is an apocalyptic number.

1111001023 is a deficient number, since it is larger than the sum of its proper divisors (101000105).

1111001023 is a wasteful number, since it uses less digits than its factorization.

1111001023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101000104.

The product of its (nonzero) digits is 6, while the sum is 10.

The square root of 1111001023 is about 33331.6819707617. The cubic root of 1111001023 is about 1035.7099605858.

Adding to 1111001023 its reverse (3201001111), we get a palindrome (4312002134).

The spelling of 1111001023 in words is "one billion, one hundred eleven million, one thousand, twenty-three".