1023319991 has 2 divisors, whose sum is σ = 1023319992. Its totient is φ = 1023319990.

The previous prime is 1023319939. The next prime is 1023320047. The reversal of 1023319991 is 1999133201.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1023319991 - 2¹⁴ = 1023303607 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1023319901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 511659995 + 511659996.

It is an arithmetic number, because the mean of its divisors is an integer number (511659996).

Almost surely, 2^1023319991 is an apocalyptic number.

1023319991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1023319991 is an equidigital number, since it uses as much as digits as its factorization.

1023319991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13122, while the sum is 38.

The square root of 1023319991 is about 31989.3730948264. The cubic root of 1023319991 is about 1007.7136765376.

The spelling of 1023319991 in words is "one billion, twenty-three million, three hundred nineteen thousand, nine hundred ninety-one".