1004002991 has 2 divisors, whose sum is σ = 1004002992. Its totient is φ = 1004002990.

The previous prime is 1004002927. The next prime is 1004003027. The reversal of 1004002991 is 1992004001.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1004002991 - 2⁶ = 1004002927 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1004002991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1004002291) 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, 502001495 + 502001496.

It is an arithmetic number, because the mean of its divisors is an integer number (502001496).

Almost surely, 2^1004002991 is an apocalyptic number.

1004002991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1004002991 is an equidigital number, since it uses as much as digits as its factorization.

1004002991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 1004002991 is about 31686.0062330361. The cubic root of 1004002991 is about 1001.3325538448.

Adding to 1004002991 its reverse (1992004001), we get a palindrome (2996006992).

The spelling of 1004002991 in words is "one billion, four million, two thousand, nine hundred ninety-one".