997169489 has 2 divisors, whose sum is σ = 997169490. Its totient is φ = 997169488.

The previous prime is 997169483. The next prime is 997169491. The reversal of 997169489 is 984961799.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 910530625 + 86638864 = 30175^2 + 9308^2 .

It is an emirp because it is prime and its reverse (984961799) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-997169489 is a prime.

It is a super-2 number, since 2×997169489² = 1988693979585042242, which contains 22 as substring.

Together with 997169491, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (997169483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498584744 + 498584745.

It is an arithmetic number, because the mean of its divisors is an integer number (498584745).

Almost surely, 2^997169489 is an apocalyptic number.

It is an amenable number.

997169489 is a deficient number, since it is larger than the sum of its proper divisors (1).

997169489 is an equidigital number, since it uses as much as digits as its factorization.

997169489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8817984, while the sum is 62.

The square root of 997169489 is about 31577.9905788826. The cubic root of 997169489 is about 999.0556047317.

The spelling of 997169489 in words is "nine hundred ninety-seven million, one hundred sixty-nine thousand, four hundred eighty-nine".