999111667 has 4 divisors (see below), whose sum is σ = 1006978816. Its totient is φ = 991244520.

The previous prime is 999111661. The next prime is 999111677. The reversal of 999111667 is 766111999.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 766111999 = 167 ⋅4587497.

It is a cyclic number.

It is not a de Polignac number, because 999111667 - 2¹¹ = 999109619 is a prime.

It is a super-3 number, since 3×999111667³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 999111667.

It is not an unprimeable number, because it can be changed into a prime (999111661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3933384 + ... + 3933637.

It is an arithmetic number, because the mean of its divisors is an integer number (251744704).

Almost surely, 2^999111667 is an apocalyptic number.

999111667 is a deficient number, since it is larger than the sum of its proper divisors (7867149).

999111667 is a wasteful number, since it uses less digits than its factorization.

999111667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7867148.

The product of its digits is 183708, while the sum is 49.

The square root of 999111667 is about 31608.7277029620. The cubic root of 999111667 is about 999.7038012750.

The spelling of 999111667 in words is "nine hundred ninety-nine million, one hundred eleven thousand, six hundred sixty-seven".