1023309999991 has 2 divisors, whose sum is σ = 1023309999992. Its totient is φ = 1023309999990.

The previous prime is 1023309999941. The next prime is 1023310000033. The reversal of 1023309999991 is 1999999033201.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1023309999991 - 2²³ = 1023301611383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1023309999941) 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, 511654999995 + 511654999996.

It is an arithmetic number, because the mean of its divisors is an integer number (511654999996).

Almost surely, 2^{1023309999991} is an apocalyptic number.

1023309999991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1023309999991 is an equidigital number, since it uses as much as digits as its factorization.

1023309999991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9565938, while the sum is 64.

The spelling of 1023309999991 in words is "one trillion, twenty-three billion, three hundred nine million, nine hundred ninety-nine thousand, nine hundred ninety-one".