997687693 has 2 divisors, whose sum is σ = 997687694. Its totient is φ = 997687692.

The previous prime is 997687681. The next prime is 997687709. The reversal of 997687693 is 396786799.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 929823049 + 67864644 = 30493^2 + 8238^2 .

It is a cyclic number.

It is not a de Polignac number, because 997687693 - 2⁵ = 997687661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (997687633) 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, 498843846 + 498843847.

It is an arithmetic number, because the mean of its divisors is an integer number (498843847).

Almost surely, 2^997687693 is an apocalyptic number.

It is an amenable number.

997687693 is a deficient number, since it is larger than the sum of its proper divisors (1).

997687693 is an equidigital number, since it uses as much as digits as its factorization.

997687693 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30862944, while the sum is 64.

The square root of 997687693 is about 31586.1946584263. The cubic root of 997687693 is about 999.2286361508.

The spelling of 997687693 in words is "nine hundred ninety-seven million, six hundred eighty-seven thousand, six hundred ninety-three".