2101611997 has 2 divisors, whose sum is σ = 2101611998. Its totient is φ = 2101611996.

The previous prime is 2101611949. The next prime is 2101612027. The reversal of 2101611997 is 7991161012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2008025721 + 93586276 = 44811^2 + 9674^2 .

It is a cyclic number.

It is not a de Polignac number, because 2101611997 - 2¹¹ = 2101609949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2101611917) 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, 1050805998 + 1050805999.

It is an arithmetic number, because the mean of its divisors is an integer number (1050805999).

Almost surely, 2^2101611997 is an apocalyptic number.

It is an amenable number.

2101611997 is a deficient number, since it is larger than the sum of its proper divisors (1).

2101611997 is an equidigital number, since it uses as much as digits as its factorization.

2101611997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6804, while the sum is 37.

The square root of 2101611997 is about 45843.3419047957. The cubic root of 2101611997 is about 1280.9067462260.

The spelling of 2101611997 in words is "two billion, one hundred one million, six hundred eleven thousand, nine hundred ninety-seven".