999953 has 2 divisors, whose sum is σ = 999954. Its totient is φ = 999952.

The previous prime is 999931. The next prime is 999959. The reversal of 999953 is 359999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 677329 + 322624 = 823^2 + 568^2 .

It is a cyclic number.

It is not a de Polignac number, because 999953 - 2¹⁸ = 737809 is a prime.

It is a nialpdrome in base 10 and base 16.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 999953.

It is not a weakly prime, because it can be changed into another prime (999959) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499976 + 499977.

It is an arithmetic number, because the mean of its divisors is an integer number (499977).

2⁹⁹⁹⁹⁵³ is an apocalyptic number.

It is an amenable number.

999953 is a deficient number, since it is larger than the sum of its proper divisors (1).

999953 is an equidigital number, since it uses as much as digits as its factorization.

999953 is an evil number, because the sum of its binary digits is even.

The product of its digits is 98415, while the sum is 44.

The square root of 999953 is about 999.9764997239. The cubic root of 999953 is about 99.9984333088.

The spelling of 999953 in words is "nine hundred ninety-nine thousand, nine hundred fifty-three".