997931303 has 2 divisors, whose sum is σ = 997931304. Its totient is φ = 997931302.

The previous prime is 997931227. The next prime is 997931339. The reversal of 997931303 is 303139799.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (303139799) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 997931303 - 2⁸ = 997931047 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (997931393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498965651 + 498965652.

It is an arithmetic number, because the mean of its divisors is an integer number (498965652).

Almost surely, 2^997931303 is an apocalyptic number.

997931303 is a deficient number, since it is larger than the sum of its proper divisors (1).

997931303 is an equidigital number, since it uses as much as digits as its factorization.

997931303 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 137781, while the sum is 44.

The square root of 997931303 is about 31590.0506963822. The cubic root of 997931303 is about 999.3099582853.

The spelling of 997931303 in words is "nine hundred ninety-seven million, nine hundred thirty-one thousand, three hundred three".