6991441999 has 2 divisors, whose sum is σ = 6991442000. Its totient is φ = 6991441998.

The previous prime is 6991441991. The next prime is 6991442011. The reversal of 6991441999 is 9991441996.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6991441999 - 2³ = 6991441991 is a prime.

It is a super-2 number, since 2×6991441999² = 97760522450762232002, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6991441991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3495720999 + 3495721000.

It is an arithmetic number, because the mean of its divisors is an integer number (3495721000).

Almost surely, 2^6991441999 is an apocalyptic number.

6991441999 is a deficient number, since it is larger than the sum of its proper divisors (1).

6991441999 is an equidigital number, since it uses as much as digits as its factorization.

6991441999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5668704, while the sum is 61.

The square root of 6991441999 is about 83614.8431739246. The cubic root of 6991441999 is about 1912.1512997710.

The spelling of 6991441999 in words is "six billion, nine hundred ninety-one million, four hundred forty-one thousand, nine hundred ninety-nine".