999611311 has 2 divisors, whose sum is σ = 999611312. Its totient is φ = 999611310.

The previous prime is 999611309. The next prime is 999611329. The reversal of 999611311 is 113116999.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 999611311 - 2¹ = 999611309 is a prime.

Together with 999611309, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999615311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499805655 + 499805656.

It is an arithmetic number, because the mean of its divisors is an integer number (499805656).

Almost surely, 2^999611311 is an apocalyptic number.

999611311 is a deficient number, since it is larger than the sum of its proper divisors (1).

999611311 is an equidigital number, since it uses as much as digits as its factorization.

999611311 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13122, while the sum is 40.

The square root of 999611311 is about 31616.6302916677. The cubic root of 999611311 is about 999.8704202098.

The spelling of 999611311 in words is "nine hundred ninety-nine million, six hundred eleven thousand, three hundred eleven".