1001113121 has 4 divisors (see below), whose sum is σ = 1018081200. Its totient is φ = 984145044.

The previous prime is 1001113103. The next prime is 1001113213. The reversal of 1001113121 is 1213111001.

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: 1213111001 = 281 ⋅4317121.

It is a cyclic number.

It is not a de Polignac number, because 1001113121 - 2¹⁰ = 1001112097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1001118121) 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, 8483951 + ... + 8484068.

It is an arithmetic number, because the mean of its divisors is an integer number (254520300).

Almost surely, 2^1001113121 is an apocalyptic number.

It is an amenable number.

1001113121 is a deficient number, since it is larger than the sum of its proper divisors (16968079).

1001113121 is an equidigital number, since it uses as much as digits as its factorization.

1001113121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16968078.

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

The square root of 1001113121 is about 31640.3716950354. The cubic root of 1001113121 is about 1000.3709027475.

Adding to 1001113121 its reverse (1213111001), we get a palindrome (2214224122).

It can be divided in two parts, 10011 and 13121, that added together give a palindrome (23132).

The spelling of 1001113121 in words is "one billion, one million, one hundred thirteen thousand, one hundred twenty-one".