1113121001 has 4 divisors (see below), whose sum is σ = 1113312912. Its totient is φ = 1112929092.

The previous prime is 1113120997. The next prime is 1113121003. The reversal of 1113121001 is 1001213111.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1001213111 = 25657 ⋅39023.

It is a cyclic number.

It is not a de Polignac number, because 1113121001 - 2² = 1113120997 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1113121003) 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 3 ways as a sum of consecutive naturals, for example, 86975 + ... + 98948.

It is an arithmetic number, because the mean of its divisors is an integer number (278328228).

Almost surely, 2^1113121001 is an apocalyptic number.

It is an amenable number.

1113121001 is a deficient number, since it is larger than the sum of its proper divisors (191911).

1113121001 is an equidigital number, since it uses as much as digits as its factorization.

1113121001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191910.

The product of its (nonzero) digits is 6, while the sum is 11.

The square root of 1113121001 is about 33363.4680601403. The cubic root of 1113121001 is about 1036.3683119842.

Adding to 1113121001 its reverse (1001213111), we get a palindrome (2114334112).

The spelling of 1113121001 in words is "one billion, one hundred thirteen million, one hundred twenty-one thousand, one".