1521812016 has 80 divisors (see below), whose sum is σ = 4442275200. Its totient is φ = 498664512.

The previous prime is 1521812003. The next prime is 1521812021. The reversal of 1521812016 is 6102181251.

1521812016 is a `hidden beast` number, since 1 + 521 + 8 + 120 + 16 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4366 + ... + 55341.

It is an arithmetic number, because the mean of its divisors is an integer number (55528440).

Almost surely, 2^1521812016 is an apocalyptic number.

1521812016 is a gapful number since it is divisible by the number (16) 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 1521812016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2221137600).

1521812016 is an abundant number, since it is smaller than the sum of its proper divisors (2920463184).

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

1521812016 is a wasteful number, since it uses less digits than its factorization.

1521812016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59783 (or 59771 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 27.

The square root of 1521812016 is about 39010.4090724514. The cubic root of 1521812016 is about 1150.2361244191.

Adding to 1521812016 its reverse (6102181251), we get a palindrome (7623993267).

The spelling of 1521812016 in words is "one billion, five hundred twenty-one million, eight hundred twelve thousand, sixteen".