1016505521 has 4 divisors (see below), whose sum is σ = 1016594544. Its totient is φ = 1016416500.

The previous prime is 1016505517. The next prime is 1016505533. The reversal of 1016505521 is 1255056101.

1016505521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1255056101 = 13 ⋅96542777.

It is a cyclic number.

It is not a de Polignac number, because 1016505521 - 2² = 1016505517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1016505541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24335 + ... + 51236.

It is an arithmetic number, because the mean of its divisors is an integer number (254148636).

Almost surely, 2^1016505521 is an apocalyptic number.

It is an amenable number.

1016505521 is a deficient number, since it is larger than the sum of its proper divisors (89023).

1016505521 is an equidigital number, since it uses as much as digits as its factorization.

1016505521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89022.

The product of its (nonzero) digits is 1500, while the sum is 26.

The square root of 1016505521 is about 31882.6837170273. The cubic root of 1016505521 is about 1005.4718446386.

The spelling of 1016505521 in words is "one billion, sixteen million, five hundred five thousand, five hundred twenty-one".