131220505439 has 8 divisors (see below), whose sum is σ = 134962063728. Its totient is φ = 127489213440.

The previous prime is 131220505433. The next prime is 131220505459. The reversal of 131220505439 is 934505022131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 131220505439 - 2³⁶ = 62501028703 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 131220505399 and 131220505408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131220505433) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2540642 + ... + 2591775.

It is an arithmetic number, because the mean of its divisors is an integer number (16870257966).

Almost surely, 2^131220505439 is an apocalyptic number.

131220505439 is a deficient number, since it is larger than the sum of its proper divisors (3741558289).

131220505439 is an equidigital number, since it uses as much as digits as its factorization.

131220505439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5133145.

The product of its (nonzero) digits is 32400, while the sum is 35.

The spelling of 131220505439 in words is "one hundred thirty-one billion, two hundred twenty million, five hundred five thousand, four hundred thirty-nine".