2991385049 has 2 divisors, whose sum is σ = 2991385050. Its totient is φ = 2991385048.

The previous prime is 2991384997. The next prime is 2991385057. The reversal of 2991385049 is 9405831992.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1879829449 + 1111555600 = 43357^2 + 33340^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2991385049 is a prime.

It is a super-2 number, since 2×2991385049² = 17896769022761464802, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2991384988 and 2991385006.

It is not a weakly prime, because it can be changed into another prime (2991385069) 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, 1495692524 + 1495692525.

It is an arithmetic number, because the mean of its divisors is an integer number (1495692525).

Almost surely, 2^2991385049 is an apocalyptic number.

It is an amenable number.

2991385049 is a deficient number, since it is larger than the sum of its proper divisors (1).

2991385049 is an equidigital number, since it uses as much as digits as its factorization.

2991385049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 699840, while the sum is 50.

The square root of 2991385049 is about 54693.5558269893. Note that the first 3 decimals coincide. The cubic root of 2991385049 is about 1440.8677012274.

The spelling of 2991385049 in words is "two billion, nine hundred ninety-one million, three hundred eighty-five thousand, forty-nine".