531689538 has 16 divisors (see below), whose sum is σ = 1100047680. Its totient is φ = 171118416.

The previous prime is 531689531. The next prime is 531689581. The reversal of 531689538 is 835986135.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (531689531) 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, 1527670 + ... + 1528017.

It is an arithmetic number, because the mean of its divisors is an integer number (68752980).

Almost surely, 2^531689538 is an apocalyptic number.

531689538 is a gapful number since it is divisible by the number (58) formed by its first and last digit.

531689538 is an abundant number, since it is smaller than the sum of its proper divisors (568358142).

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

531689538 is a wasteful number, since it uses less digits than its factorization.

531689538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3055721.

The product of its digits is 777600, while the sum is 48.

The square root of 531689538 is about 23058.3940897886. The cubic root of 531689538 is about 810.1262507065.

The spelling of 531689538 in words is "five hundred thirty-one million, six hundred eighty-nine thousand, five hundred thirty-eight".