2101111897 has 2 divisors, whose sum is σ = 2101111898. Its totient is φ = 2101111896.

The previous prime is 2101111879. The next prime is 2101111927. The reversal of 2101111897 is 7981111012.

It is a happy number.

Together with previous prime (2101111879) 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., 1514455056 + 586656841 = 38916^2 + 24221^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2101111897 is a prime.

It is not a weakly prime, because it can be changed into another prime (2101111867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050555948 + 1050555949.

It is an arithmetic number, because the mean of its divisors is an integer number (1050555949).

Almost surely, 2^2101111897 is an apocalyptic number.

It is an amenable number.

2101111897 is a deficient number, since it is larger than the sum of its proper divisors (1).

2101111897 is an equidigital number, since it uses as much as digits as its factorization.

2101111897 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 31.

The square root of 2101111897 is about 45837.8871349891. The cubic root of 2101111897 is about 1280.8051365596.

The spelling of 2101111897 in words is "two billion, one hundred one million, one hundred eleven thousand, eight hundred ninety-seven".