1030321991 has 2 divisors, whose sum is σ = 1030321992. Its totient is φ = 1030321990.

The previous prime is 1030321979. The next prime is 1030322021. The reversal of 1030321991 is 1991230301.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1030321991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1030321951) 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, 515160995 + 515160996.

It is an arithmetic number, because the mean of its divisors is an integer number (515160996).

Almost surely, 2^1030321991 is an apocalyptic number.

1030321991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1030321991 is an equidigital number, since it uses as much as digits as its factorization.

1030321991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1458, while the sum is 29.

The square root of 1030321991 is about 32098.6291140292. The cubic root of 1030321991 is about 1010.0068590849.

The spelling of 1030321991 in words is "one billion, thirty million, three hundred twenty-one thousand, nine hundred ninety-one".