1916517563 has 4 divisors (see below), whose sum is σ = 1916985408. Its totient is φ = 1916049720.

The previous prime is 1916517539. The next prime is 1916517569. The reversal of 1916517563 is 3657156191.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1916517563 - 2⁸ = 1916517307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1916517569) 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, 227723 + ... + 235988.

It is an arithmetic number, because the mean of its divisors is an integer number (479246352).

Almost surely, 2^1916517563 is an apocalyptic number.

1916517563 is a deficient number, since it is larger than the sum of its proper divisors (467845).

1916517563 is an equidigital number, since it uses as much as digits as its factorization.

1916517563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 467844.

The product of its digits is 170100, while the sum is 44.

The square root of 1916517563 is about 43778.0488715521. The cubic root of 1916517563 is about 1242.1411072318.

The spelling of 1916517563 in words is "one billion, nine hundred sixteen million, five hundred seventeen thousand, five hundred sixty-three".