999991035 has 64 divisors (see below), whose sum is σ = 1828085760. Its totient is φ = 518394240.

The previous prime is 999991009. The next prime is 999991037. The reversal of 999991035 is 530199999.

It is a happy number.

It is not a de Polignac number, because 999991035 - 2¹⁰ = 999990011 is a prime.

It is a super-3 number, since 3×999991035³ (a number of 28 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (999991037) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1097230 + ... + 1098140.

It is an arithmetic number, because the mean of its divisors is an integer number (28563840).

Almost surely, 2^999991035 is an apocalyptic number.

999991035 is a deficient number, since it is larger than the sum of its proper divisors (828094725).

999991035 is a wasteful number, since it uses less digits than its factorization.

999991035 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1145 (or 1139 counting only the distinct ones).

The product of its (nonzero) digits is 885735, while the sum is 54.

The square root of 999991035 is about 31622.6348522700. The cubic root of 999991035 is about 999.9970116577.

The spelling of 999991035 in words is "nine hundred ninety-nine million, nine hundred ninety-one thousand, thirty-five".