2105616281 has 2 divisors, whose sum is σ = 2105616282. Its totient is φ = 2105616280.

The previous prime is 2105616269. The next prime is 2105616287. The reversal of 2105616281 is 1826165012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1948339600 + 157276681 = 44140^2 + 12541^2 .

It is a cyclic number.

It is not a de Polignac number, because 2105616281 - 2²² = 2101421977 is a prime.

It is a super-2 number, since 2×2105616281² = 8867239845624541922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2105616287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1052808140 + 1052808141.

It is an arithmetic number, because the mean of its divisors is an integer number (1052808141).

Almost surely, 2^2105616281 is an apocalyptic number.

It is an amenable number.

2105616281 is a deficient number, since it is larger than the sum of its proper divisors (1).

2105616281 is an equidigital number, since it uses as much as digits as its factorization.

2105616281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 2105616281 is about 45886.9946825895. The cubic root of 2105616281 is about 1281.7197507629.

The spelling of 2105616281 in words is "two billion, one hundred five million, six hundred sixteen thousand, two hundred eighty-one".