531161136 has 120 divisors (see below), whose sum is σ = 1638843024. Its totient is φ = 159252480.

The previous prime is 531161123. The next prime is 531161143. The reversal of 531161136 is 631161135.

531161136 is a `hidden beast` number, since 5 + 3 + 11 + 611 + 36 = 666.

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 23 ways as a sum of consecutive naturals, for example, 151920 + ... + 155376.

Almost surely, 2^531161136 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 531161136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (819421512).

531161136 is an abundant number, since it is smaller than the sum of its proper divisors (1107681888).

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

531161136 is a wasteful number, since it uses less digits than its factorization.

531161136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3579 (or 3570 counting only the distinct ones).

The product of its digits is 1620, while the sum is 27.

The square root of 531161136 is about 23046.9333317906. The cubic root of 531161136 is about 809.8577893913.

Subtracting 531161136 from its reverse (631161135), we obtain a palindrome (99999999).

The spelling of 531161136 in words is "five hundred thirty-one million, one hundred sixty-one thousand, one hundred thirty-six".