1913520563 has 4 divisors (see below), whose sum is σ = 1913996280. Its totient is φ = 1913044848.

The previous prime is 1913520551. The next prime is 1913520577. The reversal of 1913520563 is 3650253191.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1913520563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1913520463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 231773 + ... + 239886.

It is an arithmetic number, because the mean of its divisors is an integer number (478499070).

Almost surely, 2^1913520563 is an apocalyptic number.

1913520563 is a deficient number, since it is larger than the sum of its proper divisors (475717).

1913520563 is an equidigital number, since it uses as much as digits as its factorization.

1913520563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 475716.

The product of its (nonzero) digits is 24300, while the sum is 35.

The square root of 1913520563 is about 43743.8059958207. The cubic root of 1913520563 is about 1241.4932935196.

The spelling of 1913520563 in words is "one billion, nine hundred thirteen million, five hundred twenty thousand, five hundred sixty-three".