999961559 has 16 divisors (see below), whose sum is σ = 1029283200. Its totient is φ = 971145504.

The previous prime is 999961541. The next prime is 999961577. The reversal of 999961559 is 955169999.

It is an interprime number because it is at equal distance from previous prime (999961541) and next prime (999961577).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999961559 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999961579) 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 15 ways as a sum of consecutive naturals, for example, 2638232 + ... + 2638610.

It is an arithmetic number, because the mean of its divisors is an integer number (64330200).

Almost surely, 2^999961559 is an apocalyptic number.

999961559 is a deficient number, since it is larger than the sum of its proper divisors (29321641).

999961559 is a wasteful number, since it uses less digits than its factorization.

999961559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 862.

The product of its digits is 8857350, while the sum is 62.

The square root of 999961559 is about 31622.1687902648. The cubic root of 999961559 is about 999.9871861691.

The spelling of 999961559 in words is "nine hundred ninety-nine million, nine hundred sixty-one thousand, five hundred fifty-nine".