997628287 has 2 divisors, whose sum is σ = 997628288. Its totient is φ = 997628286.

The previous prime is 997628263. The next prime is 997628309. The reversal of 997628287 is 782826799.

It is a strong prime.

It is an emirp because it is prime and its reverse (782826799) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 997628287 - 2¹¹ = 997626239 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (997628237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498814143 + 498814144.

It is an arithmetic number, because the mean of its divisors is an integer number (498814144).

Almost surely, 2^997628287 is an apocalyptic number.

997628287 is a deficient number, since it is larger than the sum of its proper divisors (1).

997628287 is an equidigital number, since it uses as much as digits as its factorization.

997628287 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6096384, while the sum is 58.

The square root of 997628287 is about 31585.2542652422. The cubic root of 997628287 is about 999.2088031727.

The spelling of 997628287 in words is "nine hundred ninety-seven million, six hundred twenty-eight thousand, two hundred eighty-seven".