997628369 has 2 divisors, whose sum is σ = 997628370. Its totient is φ = 997628368.

The previous prime is 997628363. The next prime is 997628371. The reversal of 997628369 is 963826799.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 964909969 + 32718400 = 31063^2 + 5720^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-997628369 is a prime.

It is a super-2 number, since 2×997628369² = 1990524725267200322, which contains 22 as substring.

Together with 997628371, 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 (997628363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498814184 + 498814185.

It is an arithmetic number, because the mean of its divisors is an integer number (498814185).

Almost surely, 2^997628369 is an apocalyptic number.

It is an amenable number.

997628369 is a deficient number, since it is larger than the sum of its proper divisors (1).

997628369 is an equidigital number, since it uses as much as digits as its factorization.

997628369 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8817984, while the sum is 59.

The square root of 997628369 is about 31585.2555633162. The cubic root of 997628369 is about 999.2088305493.

The spelling of 997628369 in words is "nine hundred ninety-seven million, six hundred twenty-eight thousand, three hundred sixty-nine".