1000030991 has 2 divisors, whose sum is σ = 1000030992. Its totient is φ = 1000030990.

The previous prime is 1000030981. The next prime is 1000031023. The reversal of 1000030991 is 1990300001.

It is a weak prime.

It is an emirp because it is prime and its reverse (1990300001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1000030991 - 2¹⁰ = 1000029967 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1000030981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500015495 + 500015496.

It is an arithmetic number, because the mean of its divisors is an integer number (500015496).

Almost surely, 2^1000030991 is an apocalyptic number.

1000030991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1000030991 is an equidigital number, since it uses as much as digits as its factorization.

1000030991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 243, while the sum is 23.

The square root of 1000030991 is about 31623.2666086222. The cubic root of 1000030991 is about 1000.0103302266.

Adding to 1000030991 its reverse (1990300001), we get a palindrome (2990330992).

The spelling of 1000030991 in words is "one billion, thirty thousand, nine hundred ninety-one".