1023445991 has 2 divisors, whose sum is σ = 1023445992. Its totient is φ = 1023445990.

The previous prime is 1023445987. The next prime is 1023445999. The reversal of 1023445991 is 1995443201.

1023445991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1023445991 - 2² = 1023445987 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1023445999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 511722995 + 511722996.

It is an arithmetic number, because the mean of its divisors is an integer number (511722996).

Almost surely, 2^1023445991 is an apocalyptic number.

1023445991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1023445991 is an equidigital number, since it uses as much as digits as its factorization.

1023445991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 1023445991 is about 31991.3424382285. The cubic root of 1023445991 is about 1007.7550343121.

The spelling of 1023445991 in words is "one billion, twenty-three million, four hundred forty-five thousand, nine hundred ninety-one".