999731693 has 2 divisors, whose sum is σ = 999731694. Its totient is φ = 999731692.

The previous prime is 999731687. The next prime is 999731713. The reversal of 999731693 is 396137999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 953450884 + 46280809 = 30878^2 + 6803^2 .

It is a cyclic number.

It is not a de Polignac number, because 999731693 - 2⁸ = 999731437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999731893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499865846 + 499865847.

It is an arithmetic number, because the mean of its divisors is an integer number (499865847).

Almost surely, 2^999731693 is an apocalyptic number.

It is an amenable number.

999731693 is a deficient number, since it is larger than the sum of its proper divisors (1).

999731693 is an equidigital number, since it uses as much as digits as its factorization.

999731693 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2480058, while the sum is 56.

The square root of 999731693 is about 31618.5340109247. The cubic root of 999731693 is about 999.9105563334.

The spelling of 999731693 in words is "nine hundred ninety-nine million, seven hundred thirty-one thousand, six hundred ninety-three".