1543431121311 has 4 divisors (see below), whose sum is σ = 2057908161752. Its totient is φ = 1028954080872.

The previous prime is 1543431121289. The next prime is 1543431121343. The reversal of 1543431121311 is 1131211343451.

It is a happy number.

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

It is not a de Polignac number, because 1543431121311 - 2⁶ = 1543431121247 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1543435121311) 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, 257238520216 + ... + 257238520221.

It is an arithmetic number, because the mean of its divisors is an integer number (514477040438).

Almost surely, 2^{1543431121311} is an apocalyptic number.

1543431121311 is a deficient number, since it is larger than the sum of its proper divisors (514477040441).

1543431121311 is an equidigital number, since it uses as much as digits as its factorization.

1543431121311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 514477040440.

The product of its digits is 4320, while the sum is 30.

Adding to 1543431121311 its reverse (1131211343451), we get a palindrome (2674642464762).

The spelling of 1543431121311 in words is "one trillion, five hundred forty-three billion, four hundred thirty-one million, one hundred twenty-one thousand, three hundred eleven".