1002444991 has 2 divisors, whose sum is σ = 1002444992. Its totient is φ = 1002444990.

The previous prime is 1002444931. The next prime is 1002445019. The reversal of 1002444991 is 1994442001.

It is a strong prime.

It is an emirp because it is prime and its reverse (1994442001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1002444991 - 2¹¹ = 1002442943 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1002444931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 501222495 + 501222496.

It is an arithmetic number, because the mean of its divisors is an integer number (501222496).

Almost surely, 2^1002444991 is an apocalyptic number.

1002444991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1002444991 is an equidigital number, since it uses as much as digits as its factorization.

1002444991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 1002444991 is about 31661.4117025757. The cubic root of 1002444991 is about 1000.8143336807.

Adding to 1002444991 its reverse (1994442001), we get a palindrome (2996886992).

The spelling of 1002444991 in words is "one billion, two million, four hundred forty-four thousand, nine hundred ninety-one".