999789953 has 2 divisors, whose sum is σ = 999789954. Its totient is φ = 999789952.

The previous prime is 999789929. The next prime is 999789983. The reversal of 999789953 is 359987999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 759167809 + 240622144 = 27553^2 + 15512^2 .

It is a cyclic number.

It is not a de Polignac number, because 999789953 - 2¹⁰ = 999788929 is a prime.

It is not a weakly prime, because it can be changed into another prime (999789983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499894976 + 499894977.

It is an arithmetic number, because the mean of its divisors is an integer number (499894977).

Almost surely, 2^999789953 is an apocalyptic number.

It is an amenable number.

999789953 is a deficient number, since it is larger than the sum of its proper divisors (1).

999789953 is an equidigital number, since it uses as much as digits as its factorization.

999789953 is an evil number, because the sum of its binary digits is even.

The product of its digits is 49601160, while the sum is 68.

The square root of 999789953 is about 31619.4552925885. The cubic root of 999789953 is about 999.9299794306.

The spelling of 999789953 in words is "nine hundred ninety-nine million, seven hundred eighty-nine thousand, nine hundred fifty-three".