999318521 has 2 divisors, whose sum is σ = 999318522. Its totient is φ = 999318520.

The previous prime is 999318493. The next prime is 999318553. The reversal of 999318521 is 125813999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 754051600 + 245266921 = 27460^2 + 15661^2 .

It is a cyclic number.

It is not a de Polignac number, because 999318521 - 2⁶ = 999318457 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (999318571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499659260 + 499659261.

It is an arithmetic number, because the mean of its divisors is an integer number (499659261).

Almost surely, 2^999318521 is an apocalyptic number.

It is an amenable number.

999318521 is a deficient number, since it is larger than the sum of its proper divisors (1).

999318521 is an equidigital number, since it uses as much as digits as its factorization.

999318521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 174960, while the sum is 47.

The square root of 999318521 is about 31611.9996362141. Note that the first 3 decimals coincide. The cubic root of 999318521 is about 999.7727887123.

The spelling of 999318521 in words is "nine hundred ninety-nine million, three hundred eighteen thousand, five hundred twenty-one".