999172259 has 2 divisors, whose sum is σ = 999172260. Its totient is φ = 999172258.

The previous prime is 999172249. The next prime is 999172261. The reversal of 999172259 is 952271999.

999172259 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999172259 is a prime.

Together with 999172261, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 999172259.

It is not a weakly prime, because it can be changed into another prime (999172249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499586129 + 499586130.

It is an arithmetic number, because the mean of its divisors is an integer number (499586130).

Almost surely, 2^999172259 is an apocalyptic number.

999172259 is a deficient number, since it is larger than the sum of its proper divisors (1).

999172259 is an equidigital number, since it uses as much as digits as its factorization.

999172259 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 918540, while the sum is 53.

The square root of 999172259 is about 31609.6861578852. The cubic root of 999172259 is about 999.7240101700.

The spelling of 999172259 in words is "nine hundred ninety-nine million, one hundred seventy-two thousand, two hundred fifty-nine".