531645136 has 40 divisors (see below), whose sum is σ = 1124999424. Its totient is φ = 241378560.

The previous prime is 531645091. The next prime is 531645167. The reversal of 531645136 is 631546135.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 290721 + ... + 292543.

Almost surely, 2^531645136 is an apocalyptic number.

It is an amenable number.

531645136 is an abundant number, since it is smaller than the sum of its proper divisors (593354288).

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

531645136 is a wasteful number, since it uses less digits than its factorization.

531645136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3499 (or 3493 counting only the distinct ones).

The product of its digits is 32400, while the sum is 34.

The square root of 531645136 is about 23057.4312532858. The cubic root of 531645136 is about 810.1036985562.

Subtracting 531645136 from its reverse (631546135), we obtain a palindrome (99900999).

The spelling of 531645136 in words is "five hundred thirty-one million, six hundred forty-five thousand, one hundred thirty-six".