2011998997 has 2 divisors, whose sum is σ = 2011998998. Its totient is φ = 2011998996.

The previous prime is 2011998979. The next prime is 2011999019. The reversal of 2011998997 is 7998991102.

Together with previous prime (2011998979) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1946486161 + 65512836 = 44119^2 + 8094^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2011998997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2011998907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1005999498 + 1005999499.

It is an arithmetic number, because the mean of its divisors is an integer number (1005999499).

Almost surely, 2^2011998997 is an apocalyptic number.

It is an amenable number.

2011998997 is a deficient number, since it is larger than the sum of its proper divisors (1).

2011998997 is an equidigital number, since it uses as much as digits as its factorization.

2011998997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 734832, while the sum is 55.

The square root of 2011998997 is about 44855.3118036203. The cubic root of 2011998997 is about 1262.4356592639.

The spelling of 2011998997 in words is "two billion, eleven million, nine hundred ninety-eight thousand, nine hundred ninety-seven".