131431422121 has 4 divisors (see below), whose sum is σ = 131458310100. Its totient is φ = 131404534144.

The previous prime is 131431422103. The next prime is 131431422197. The reversal of 131431422121 is 121224134131.

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 118653380521 + 12778041600 = 344461^2 + 113040^2 .

It is a cyclic number.

It is not a de Polignac number, because 131431422121 - 2¹³ = 131431413929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131431422821) 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, 13436656 + ... + 13446433.

It is an arithmetic number, because the mean of its divisors is an integer number (32864577525).

Almost surely, 2^131431422121 is an apocalyptic number.

It is an amenable number.

131431422121 is a deficient number, since it is larger than the sum of its proper divisors (26887979).

131431422121 is an equidigital number, since it uses as much as digits as its factorization.

131431422121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26887978.

The product of its digits is 1152, while the sum is 25.

Adding to 131431422121 its reverse (121224134131), we get a palindrome (252655556252).

The spelling of 131431422121 in words is "one hundred thirty-one billion, four hundred thirty-one million, four hundred twenty-two thousand, one hundred twenty-one".