11431321001 has 4 divisors (see below), whose sum is σ = 11559762900. Its totient is φ = 11302879104.

The previous prime is 11431320983. The next prime is 11431321049. The reversal of 11431321001 is 10012313411.

11431321001 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 7183410025 + 4247910976 = 84755^2 + 65176^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11431321001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11431321061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64220816 + ... + 64220993.

It is an arithmetic number, because the mean of its divisors is an integer number (2889940725).

Almost surely, 2^11431321001 is an apocalyptic number.

It is an amenable number.

11431321001 is a deficient number, since it is larger than the sum of its proper divisors (128441899).

11431321001 is an equidigital number, since it uses as much as digits as its factorization.

11431321001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128441898.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 11431321001 its reverse (10012313411), we get a palindrome (21443634412).

The spelling of 11431321001 in words is "eleven billion, four hundred thirty-one million, three hundred twenty-one thousand, one".