131559428 has 144 divisors (see below), whose sum is σ = 325328640. Its totient is φ = 45239040.

The previous prime is 131559377. The next prime is 131559433. The reversal of 131559428 is 824955131.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 131559391 and 131559400.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1277225 + ... + 1277327.

Almost surely, 2^131559428 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 131559428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (162664320).

131559428 is an abundant number, since it is smaller than the sum of its proper divisors (193769212).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

131559428 is a wasteful number, since it uses less digits than its factorization.

131559428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178 (or 165 counting only the distinct ones).

The product of its digits is 43200, while the sum is 38.

The square root of 131559428 is about 11469.9358324273. The cubic root of 131559428 is about 508.5972319496.

The spelling of 131559428 in words is "one hundred thirty-one million, five hundred fifty-nine thousand, four hundred twenty-eight".