997769 has 2 divisors, whose sum is σ = 997770. Its totient is φ = 997768.

The previous prime is 997751. The next prime is 997783. The reversal of 997769 is 967799.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 990025 + 7744 = 995^2 + 88^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-997769 is a prime.

It is a super-2 number, since 2×997769² = 1991085954722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (997739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498884 + 498885.

It is an arithmetic number, because the mean of its divisors is an integer number (498885).

2⁹⁹⁷⁷⁶⁹ is an apocalyptic number.

It is an amenable number.

997769 is a deficient number, since it is larger than the sum of its proper divisors (1).

997769 is an equidigital number, since it uses as much as digits as its factorization.

997769 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 214326, while the sum is 47.

The square root of 997769 is about 998.8838771349. The cubic root of 997769 is about 99.9255779607.

The spelling of 997769 in words is "nine hundred ninety-seven thousand, seven hundred sixty-nine".