997608769 has 2 divisors, whose sum is σ = 997608770. Its totient is φ = 997608768.

The previous prime is 997608767. The next prime is 997608797. The reversal of 997608769 is 967806799.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 995087025 + 2521744 = 31545^2 + 1588^2 .

It is a cyclic number.

It is not a de Polignac number, because 997608769 - 2¹ = 997608767 is a prime.

It is a super-2 number, since 2×997608769² = 1990446511971390722, which contains 22 as substring.

Together with 997608767, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (997608767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498804384 + 498804385.

It is an arithmetic number, because the mean of its divisors is an integer number (498804385).

Almost surely, 2^997608769 is an apocalyptic number.

It is an amenable number.

997608769 is a deficient number, since it is larger than the sum of its proper divisors (1).

997608769 is an equidigital number, since it uses as much as digits as its factorization.

997608769 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10287648, while the sum is 61.

The square root of 997608769 is about 31584.9452904386. The cubic root of 997608769 is about 999.2022868229.

The spelling of 997608769 in words is "nine hundred ninety-seven million, six hundred eight thousand, seven hundred sixty-nine".