999685229 has 2 divisors, whose sum is σ = 999685230. Its totient is φ = 999685228.

The previous prime is 999685223. The next prime is 999685231. The reversal of 999685229 is 922586999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 848149129 + 151536100 = 29123^2 + 12310^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999685229 is a prime.

Together with 999685231, 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 (999685223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499842614 + 499842615.

It is an arithmetic number, because the mean of its divisors is an integer number (499842615).

Almost surely, 2^999685229 is an apocalyptic number.

It is an amenable number.

999685229 is a deficient number, since it is larger than the sum of its proper divisors (1).

999685229 is an equidigital number, since it uses as much as digits as its factorization.

999685229 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6298560, while the sum is 59.

The square root of 999685229 is about 31617.7992434641. The cubic root of 999685229 is about 999.8950653224.

The spelling of 999685229 in words is "nine hundred ninety-nine million, six hundred eighty-five thousand, two hundred twenty-nine".