131440434523 has 4 divisors (see below), whose sum is σ = 137155236048. Its totient is φ = 125725633000.

The previous prime is 131440434491. The next prime is 131440434529. The reversal of 131440434523 is 325434044131.

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 131440434523 - 2⁵ = 131440434491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131440434529) 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, 2857400728 + ... + 2857400773.

It is an arithmetic number, because the mean of its divisors is an integer number (34288809012).

Almost surely, 2^131440434523 is an apocalyptic number.

131440434523 is a deficient number, since it is larger than the sum of its proper divisors (5714801525).

131440434523 is an equidigital number, since it uses as much as digits as its factorization.

131440434523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5714801524.

The product of its (nonzero) digits is 69120, while the sum is 34.

Adding to 131440434523 its reverse (325434044131), we get a palindrome (456874478654).

The spelling of 131440434523 in words is "one hundred thirty-one billion, four hundred forty million, four hundred thirty-four thousand, five hundred twenty-three".