1111121001 has 6 divisors (see below), whose sum is σ = 1604952570. Its totient is φ = 740747328.

The previous prime is 1111120957. The next prime is 1111121021. The reversal of 1111121001 is 1001211111.

It can be written as a sum of positive squares in only one way, i.e., 1110488976 + 632025 = 33324^2 + 795^2 .

It is not a de Polignac number, because 1111121001 - 2¹⁸ = 1110858857 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 123457889 = 1111121001 / (1 + 1 + 1 + 1 + 1 + 2 + 1 + 0 + 0 + 1).

It is not an unprimeable number, because it can be changed into a prime (1111121021) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 61728936 + ... + 61728953.

It is an arithmetic number, because the mean of its divisors is an integer number (267492095).

Almost surely, 2^1111121001 is an apocalyptic number.

It is an amenable number.

1111121001 is a deficient number, since it is larger than the sum of its proper divisors (493831569).

1111121001 is a wasteful number, since it uses less digits than its factorization.

1111121001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123457895 (or 123457892 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 9.

The square root of 1111121001 is about 33333.4816813366. The cubic root of 1111121001 is about 1035.7472416606.

Adding to 1111121001 its reverse (1001211111), we get a palindrome (2112332112).

The spelling of 1111121001 in words is "one billion, one hundred eleven million, one hundred twenty-one thousand, one".