130531428 has 18 divisors (see below), whose sum is σ = 329954534. Its totient is φ = 43510464.

The previous prime is 130531409. The next prime is 130531433. The reversal of 130531428 is 824135031.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 72284004 + 58247424 = 8502^2 + 7632^2 .

It is a tau number, because it is divible by the number of its divisors (18).

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 5 ways as a sum of consecutive naturals, for example, 1812901 + ... + 1812972.

Almost surely, 2^130531428 is an apocalyptic number.

130531428 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

130531428 is an abundant number, since it is smaller than the sum of its proper divisors (199423106).

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

130531428 is a wasteful number, since it uses less digits than its factorization.

130531428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3625883 (or 3625878 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 130531428 is about 11425.0351421779. The cubic root of 130531428 is about 507.2690471219.

Adding to 130531428 its reverse (824135031), we get a palindrome (954666459).

The spelling of 130531428 in words is "one hundred thirty million, five hundred thirty-one thousand, four hundred twenty-eight".