1001311121 has 4 divisors (see below), whose sum is σ = 1002220032. Its totient is φ = 1000402212.

The previous prime is 1001311111. The next prime is 1001311123. The reversal of 1001311121 is 1211131001.

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.

It is a cyclic number.

It is not a de Polignac number, because 1001311121 - 2¹⁰ = 1001310097 is a prime.

It is a super-2 number, since 2×1001311121² = 2005247922076553282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1001311123) 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, 452801 + ... + 455006.

It is an arithmetic number, because the mean of its divisors is an integer number (250555008).

Almost surely, 2^1001311121 is an apocalyptic number.

It is an amenable number.

1001311121 is a deficient number, since it is larger than the sum of its proper divisors (908911).

1001311121 is an equidigital number, since it uses as much as digits as its factorization.

1001311121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 908910.

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

The square root of 1001311121 is about 31643.5004542797. The cubic root of 1001311121 is about 1000.4368494681.

Adding to 1001311121 its reverse (1211131001), we get a palindrome (2212442122).

The spelling of 1001311121 in words is "one billion, one million, three hundred eleven thousand, one hundred twenty-one".