999685231 has 2 divisors, whose sum is σ = 999685232. Its totient is φ = 999685230.

The previous prime is 999685229. The next prime is 999685237. The reversal of 999685231 is 132586999.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 999685231 - 2¹ = 999685229 is a prime.

It is a super-2 number, since 2×999685231² = 1998741122159046722, which contains 22 as substring.

Together with 999685229, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999685237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499842615 + 499842616.

It is an arithmetic number, because the mean of its divisors is an integer number (499842616).

Almost surely, 2^999685231 is an apocalyptic number.

999685231 is a deficient number, since it is larger than the sum of its proper divisors (1).

999685231 is an equidigital number, since it uses as much as digits as its factorization.

999685231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1049760, while the sum is 52.

The square root of 999685231 is about 31617.7992750919. The cubic root of 999685231 is about 999.8950659892.

The spelling of 999685231 in words is "nine hundred ninety-nine million, six hundred eighty-five thousand, two hundred thirty-one".