531142878 has 32 divisors (see below), whose sum is σ = 1215002880. Its totient is φ = 151634880.

The previous prime is 531142877. The next prime is 531142897. The reversal of 531142878 is 878241135.

It is a super-2 number, since 2×531142878² = 564225513700245768, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531142877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57933 + ... + 66471.

It is an arithmetic number, because the mean of its divisors is an integer number (37968840).

Almost surely, 2^531142878 is an apocalyptic number.

531142878 is an abundant number, since it is smaller than the sum of its proper divisors (683860002).

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

531142878 is a wasteful number, since it uses less digits than its factorization.

531142878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10032.

The product of its digits is 53760, while the sum is 39.

The square root of 531142878 is about 23046.5372236265. The cubic root of 531142878 is about 809.8485100020.

The spelling of 531142878 in words is "five hundred thirty-one million, one hundred forty-two thousand, eight hundred seventy-eight".