1521530532 has 72 divisors (see below), whose sum is σ = 4128238296. Its totient is φ = 470790144.

The previous prime is 1521530531. The next prime is 1521530573. The reversal of 1521530532 is 2350351251.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 738426276 + 783104256 = 27174^2 + 27984^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1521530496 and 1521530505.

It is not an unprimeable number, because it can be changed into a prime (1521530531) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27648 + ... + 61704.

It is an arithmetic number, because the mean of its divisors is an integer number (57336643).

Almost surely, 2^1521530532 is an apocalyptic number.

1521530532 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1521530532, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2064119148).

1521530532 is an abundant number, since it is smaller than the sum of its proper divisors (2606707764).

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

1521530532 is a wasteful number, since it uses less digits than its factorization.

1521530532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34157 (or 34152 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 27.

The square root of 1521530532 is about 39006.8010992955. The cubic root of 1521530532 is about 1150.1652017239.

Adding to 1521530532 its reverse (2350351251), we get a palindrome (3871881783).

The spelling of 1521530532 in words is "one billion, five hundred twenty-one million, five hundred thirty thousand, five hundred thirty-two".