1521225312 has 96 divisors (see below), whose sum is σ = 4098511872. Its totient is φ = 493814784.

The previous prime is 1521225311. The next prime is 1521225341. The reversal of 1521225312 is 2135221251.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1521225311) 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 15 ways as a sum of consecutive naturals, for example, 1050573 + ... + 1052019.

It is an arithmetic number, because the mean of its divisors is an integer number (42692832).

Almost surely, 2^1521225312 is an apocalyptic number.

1521225312 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 1521225312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2049255936).

1521225312 is an abundant number, since it is smaller than the sum of its proper divisors (2577286560).

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

1521225312 is a wasteful number, since it uses less digits than its factorization.

1521225312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1740 (or 1732 counting only the distinct ones).

The product of its digits is 1200, while the sum is 24.

The square root of 1521225312 is about 39002.8885084169. Note that the first 3 decimals coincide. The cubic root of 1521225312 is about 1150.0882886218.

Adding to 1521225312 its reverse (2135221251), we get a palindrome (3656446563).

The spelling of 1521225312 in words is "one billion, five hundred twenty-one million, two hundred twenty-five thousand, three hundred twelve".