2100991369 has 2 divisors, whose sum is σ = 2100991370. Its totient is φ = 2100991368.

The previous prime is 2100991307. The next prime is 2100991379. The reversal of 2100991369 is 9631990012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1311381369 + 789610000 = 36213^2 + 28100^2 .

It is a cyclic number.

It is not a de Polignac number, because 2100991369 - 2¹³ = 2100983177 is a prime.

It is a super-2 number, since 2×2100991369² = 8828329465224988322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2100991379) 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, 1050495684 + 1050495685.

It is an arithmetic number, because the mean of its divisors is an integer number (1050495685).

Almost surely, 2^2100991369 is an apocalyptic number.

It is an amenable number.

2100991369 is a deficient number, since it is larger than the sum of its proper divisors (1).

2100991369 is an equidigital number, since it uses as much as digits as its factorization.

2100991369 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26244, while the sum is 40.

The square root of 2100991369 is about 45836.5723958500. The cubic root of 2100991369 is about 1280.7806454265.

The spelling of 2100991369 in words is "two billion, one hundred million, nine hundred ninety-one thousand, three hundred sixty-nine".