1516105521 has 18 divisors (see below), whose sum is σ = 2547470562. Its totient is φ = 866345760.

The previous prime is 1516105501. The next prime is 1516105531. The reversal of 1516105521 is 1255016151.

1516105521 is a `hidden beast` number, since 1 + 51 + 61 + 0 + 552 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1501175025 + 14930496 = 38745^2 + 3864^2 .

It is not a de Polignac number, because 1516105521 - 2⁵ = 1516105489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1516105501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1718500 + ... + 1719381.

Almost surely, 2^1516105521 is an apocalyptic number.

It is an amenable number.

1516105521 is a deficient number, since it is larger than the sum of its proper divisors (1031365041).

1516105521 is a wasteful number, since it uses less digits than its factorization.

1516105521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3437901 (or 3437891 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 27.

The square root of 1516105521 is about 38937.1997067072. The cubic root of 1516105521 is about 1148.7966040541.

The spelling of 1516105521 in words is "one billion, five hundred sixteen million, one hundred five thousand, five hundred twenty-one".