1121011001 has 16 divisors (see below), whose sum is σ = 1288949760. Its totient is φ = 964216080.

The previous prime is 1121010907. The next prime is 1121011013. The reversal of 1121011001 is 1001101211.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1121011001 - 2²² = 1116816697 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1121011001.

It is not an unprimeable number, because it can be changed into a prime (1121011051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 182360 + ... + 188406.

It is an arithmetic number, because the mean of its divisors is an integer number (80559360).

Almost surely, 2^1121011001 is an apocalyptic number.

1121011001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1121011001 is a deficient number, since it is larger than the sum of its proper divisors (167938759).

1121011001 is a wasteful number, since it uses less digits than its factorization.

1121011001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6964.

The product of its (nonzero) digits is 2, while the sum is 8.

The square root of 1121011001 is about 33481.5023707121. The cubic root of 1121011001 is about 1038.8112035814.

Adding to 1121011001 its reverse (1001101211), we get a palindrome (2122112212).

It can be divided in two parts, 11 and 21011001, that added together give a palindrome (21011012).

The spelling of 1121011001 in words is "one billion, one hundred twenty-one million, eleven thousand, one".