1111001011 has 4 divisors (see below), whose sum is σ = 1112014872. Its totient is φ = 1109987152.

The previous prime is 1111000997. The next prime is 1111001027. The reversal of 1111001011 is 1101001111.

It is a happy number.

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 1111001011 - 2²³ = 1102612403 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1111000985 and 1111001003.

It is not an unprimeable number, because it can be changed into a prime (1111008011) 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, 505285 + ... + 507478.

It is an arithmetic number, because the mean of its divisors is an integer number (278003718).

Almost surely, 2^1111001011 is an apocalyptic number.

1111001011 is a deficient number, since it is larger than the sum of its proper divisors (1013861).

1111001011 is a wasteful number, since it uses less digits than its factorization.

1111001011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1013860.

The product of its (nonzero) digits is 1, while the sum is 7.

The square root of 1111001011 is about 33331.6817907528. The cubic root of 1111001011 is about 1035.7099568568.

Adding to 1111001011 its reverse (1101001111), we get a palindrome (2212002122).

The spelling of 1111001011 in words is "one billion, one hundred eleven million, one thousand, eleven".