1101121001 has 4 divisors (see below), whose sum is σ = 1102482900. Its totient is φ = 1099759104.

The previous prime is 1101120997. The next prime is 1101121009. The reversal of 1101121001 is 1001211011.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 589275625 + 511845376 = 24275^2 + 22624^2 .

It is a cyclic number.

It is not a de Polignac number, because 1101121001 - 2² = 1101120997 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 1101121001.

It is not an unprimeable number, because it can be changed into a prime (1101121009) 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, 679736 + ... + 681353.

It is an arithmetic number, because the mean of its divisors is an integer number (275620725).

Almost surely, 2^1101121001 is an apocalyptic number.

It is an amenable number.

1101121001 is a deficient number, since it is larger than the sum of its proper divisors (1361899).

1101121001 is an equidigital number, since it uses as much as digits as its factorization.

1101121001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1361898.

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

The square root of 1101121001 is about 33183.1433260925. The cubic root of 1101121001 is about 1032.6306591445.

Adding to 1101121001 its reverse (1001211011), we get a palindrome (2102332012).

The spelling of 1101121001 in words is "one billion, one hundred one million, one hundred twenty-one thousand, one".