1231423343511 has 4 divisors (see below), whose sum is σ = 1641897791352. Its totient is φ = 820948895672.

The previous prime is 1231423343489. The next prime is 1231423343531. The reversal of 1231423343511 is 1153433241321.

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

It is a cyclic number.

It is not a de Polignac number, because 1231423343511 - 2¹³ = 1231423335319 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231423343531) 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, 205237223916 + ... + 205237223921.

It is an arithmetic number, because the mean of its divisors is an integer number (410474447838).

Almost surely, 2^{1231423343511} is an apocalyptic number.

1231423343511 is a deficient number, since it is larger than the sum of its proper divisors (410474447841).

1231423343511 is an equidigital number, since it uses as much as digits as its factorization.

1231423343511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410474447840.

The product of its digits is 25920, while the sum is 33.

Adding to 1231423343511 its reverse (1153433241321), we get a palindrome (2384856584832).

The spelling of 1231423343511 in words is "one trillion, two hundred thirty-one billion, four hundred twenty-three million, three hundred forty-three thousand, five hundred eleven".