131111431421 has 4 divisors (see below), whose sum is σ = 132314288700. Its totient is φ = 129908574144.

The previous prime is 131111431307. The next prime is 131111431453. The reversal of 131111431421 is 124134111131.

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 78447607225 + 52663824196 = 280085^2 + 229486^2 .

It is a cyclic number.

It is not a de Polignac number, because 131111431421 - 2²⁶ = 131044322557 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131111431471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 601428476 + ... + 601428693.

It is an arithmetic number, because the mean of its divisors is an integer number (33078572175).

Almost surely, 2^131111431421 is an apocalyptic number.

It is an amenable number.

131111431421 is a deficient number, since it is larger than the sum of its proper divisors (1202857279).

131111431421 is a wasteful number, since it uses less digits than its factorization.

131111431421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1202857278.

The product of its digits is 288, while the sum is 23.

Adding to 131111431421 its reverse (124134111131), we get a palindrome (255245542552).

The spelling of 131111431421 in words is "one hundred thirty-one billion, one hundred eleven million, four hundred thirty-one thousand, four hundred twenty-one".