999961563 has 8 divisors (see below), whose sum is σ = 1334002176. Its totient is φ = 666281000.

The previous prime is 999961541. The next prime is 999961577. The reversal of 999961563 is 365169999.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 999961563 - 2²² = 995767259 is a prime.

It is not an unprimeable number, because it can be changed into a prime (999961163) 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 7 ways as a sum of consecutive naturals, for example, 83463 + ... + 94688.

It is an arithmetic number, because the mean of its divisors is an integer number (166750272).

Almost surely, 2^999961563 is an apocalyptic number.

999961563 is a deficient number, since it is larger than the sum of its proper divisors (334040613).

999961563 is a wasteful number, since it uses less digits than its factorization.

999961563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180025.

The product of its digits is 3542940, while the sum is 57.

The square root of 999961563 is about 31622.1688535116. The cubic root of 999961563 is about 999.9871875025.

The spelling of 999961563 in words is "nine hundred ninety-nine million, nine hundred sixty-one thousand, five hundred sixty-three".