1521972801 has 16 divisors (see below), whose sum is σ = 2255505600. Its totient is φ = 1014319584.

The previous prime is 1521972797. The next prime is 1521972811. The reversal of 1521972801 is 1082791251.

It is a happy number.

It is not a de Polignac number, because 1521972801 - 2² = 1521972797 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1521972811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 98910 + ... + 113256.

It is an arithmetic number, because the mean of its divisors is an integer number (140969100).

Almost surely, 2^1521972801 is an apocalyptic number.

It is an amenable number.

1521972801 is a deficient number, since it is larger than the sum of its proper divisors (733532799).

1521972801 is a wasteful number, since it uses less digits than its factorization.

1521972801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18285 (or 18279 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 36.

The square root of 1521972801 is about 39012.4698141504. The cubic root of 1521972801 is about 1150.2766318757.

The spelling of 1521972801 in words is "one billion, five hundred twenty-one million, nine hundred seventy-two thousand, eight hundred one".