999961995 has 8 divisors (see below), whose sum is σ = 1599939216. Its totient is φ = 533313056.

The previous prime is 999961979. The next prime is 999962057. The reversal of 999961995 is 599169999.

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 999961995 - 2⁴ = 999961979 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33332052 + ... + 33332081.

It is an arithmetic number, because the mean of its divisors is an integer number (199992402).

Almost surely, 2^999961995 is an apocalyptic number.

999961995 is a deficient number, since it is larger than the sum of its proper divisors (599977221).

999961995 is a wasteful number, since it uses less digits than its factorization.

999961995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66664141.

The product of its digits is 15943230, while the sum is 66.

The square root of 999961995 is about 31622.1756841619. The cubic root of 999961995 is about 999.9873315062.

The spelling of 999961995 in words is "nine hundred ninety-nine million, nine hundred sixty-one thousand, nine hundred ninety-five".