531312540 has 48 divisors (see below), whose sum is σ = 1622920320. Its totient is φ = 128802880.

The previous prime is 531312539. The next prime is 531312557. The reversal of 531312540 is 45213135.

It is a super-2 number, since 2×531312540² = 564586030322503200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 531312540.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 401850 + ... + 403169.

It is an arithmetic number, because the mean of its divisors is an integer number (33810840).

Almost surely, 2^531312540 is an apocalyptic number.

It is an amenable number.

531312540 is an abundant number, since it is smaller than the sum of its proper divisors (1091607780).

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

531312540 is a wasteful number, since it uses less digits than its factorization.

531312540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 805042 (or 805040 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 531312540 is about 23050.2177863898. The cubic root of 531312540 is about 809.9347302993.

Adding to 531312540 its reverse (45213135), we get a palindrome (576525675).

The spelling of 531312540 in words is "five hundred thirty-one million, three hundred twelve thousand, five hundred forty".