1531520536 has 128 divisors (see below), whose sum is σ = 3743308800. Its totient is φ = 570447360.

The previous prime is 1531520533. The next prime is 1531520579. The reversal of 1531520536 is 6350251351.

It is a junction number, because it is equal to n+sod(n) for n = 1531520498 and 1531520507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1531520533) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 3637606 + ... + 3638026.

It is an arithmetic number, because the mean of its divisors is an integer number (29244600).

Almost surely, 2^1531520536 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 1531520536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1871654400).

1531520536 is an abundant number, since it is smaller than the sum of its proper divisors (2211788264).

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

1531520536 is a wasteful number, since it uses less digits than its factorization.

1531520536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 729 (or 725 counting only the distinct ones).

The product of its (nonzero) digits is 13500, while the sum is 31.

The square root of 1531520536 is about 39134.6462357845. The cubic root of 1531520536 is about 1152.6769486905.

Adding to 1531520536 its reverse (6350251351), we get a palindrome (7881771887).

The spelling of 1531520536 in words is "one billion, five hundred thirty-one million, five hundred twenty thousand, five hundred thirty-six".