993631693 has 2 divisors, whose sum is σ = 993631694. Its totient is φ = 993631692.

The previous prime is 993631663. The next prime is 993631703. The reversal of 993631693 is 396136399.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 557573769 + 436057924 = 23613^2 + 20882^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-993631693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (993631603) 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, 496815846 + 496815847.

It is an arithmetic number, because the mean of its divisors is an integer number (496815847).

Almost surely, 2^993631693 is an apocalyptic number.

It is an amenable number.

993631693 is a deficient number, since it is larger than the sum of its proper divisors (1).

993631693 is an equidigital number, since it uses as much as digits as its factorization.

993631693 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 708588, while the sum is 49.

The square root of 993631693 is about 31521.9240053649. The cubic root of 993631693 is about 997.8727088413.

The spelling of 993631693 in words is "nine hundred ninety-three million, six hundred thirty-one thousand, six hundred ninety-three".