999559901 has 8 divisors (see below), whose sum is σ = 1005123840. Its totient is φ = 994007952.

The previous prime is 999559879. The next prime is 999559927. The reversal of 999559901 is 109955999.

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 999559901 - 2⁶ = 999559837 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 (999559991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 201416 + ... + 206318.

It is an arithmetic number, because the mean of its divisors is an integer number (125640480).

Almost surely, 2^999559901 is an apocalyptic number.

It is an amenable number.

999559901 is a deficient number, since it is larger than the sum of its proper divisors (5563939).

999559901 is a wasteful number, since it uses less digits than its factorization.

999559901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5995.

The product of its (nonzero) digits is 1476225, while the sum is 56.

The square root of 999559901 is about 31615.8172597199. The cubic root of 999559901 is about 999.8532788073.

It can be divided in two parts, 9995 and 59901, that added together give a palindrome (69896).

The spelling of 999559901 in words is "nine hundred ninety-nine million, five hundred fifty-nine thousand, nine hundred one".