131128420 has 12 divisors (see below), whose sum is σ = 275369724. Its totient is φ = 52451360.

The previous prime is 131128411. The next prime is 131128427. The reversal of 131128420 is 24821131.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 27373824 + 103754596 = 5232^2 + 10186^2 .

It is a junction number, because it is equal to n+sod(n) for n = 131128391 and 131128400.

It is not an unprimeable number, because it can be changed into a prime (131128427) 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, 3278191 + ... + 3278230.

It is an arithmetic number, because the mean of its divisors is an integer number (22947477).

Almost surely, 2^131128420 is an apocalyptic number.

131128420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131128420 is an abundant number, since it is smaller than the sum of its proper divisors (144241304).

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

131128420 is a wasteful number, since it uses less digits than its factorization.

131128420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6556430 (or 6556428 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 131128420 is about 11451.1318217895. The cubic root of 131128420 is about 508.0412112391.

Adding to 131128420 its reverse (24821131), we get a palindrome (155949551).

The spelling of 131128420 in words is "one hundred thirty-one million, one hundred twenty-eight thousand, four hundred twenty".