2105715561 has 16 divisors (see below), whose sum is σ = 2848668480. Its totient is φ = 1383372800.

The previous prime is 2105715559. The next prime is 2105715571. The reversal of 2105715561 is 1655175012.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 2105715561 - 2¹ = 2105715559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2105715511) 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 in 15 ways as a sum of consecutive naturals, for example, 89305 + ... + 110393.

It is an arithmetic number, because the mean of its divisors is an integer number (178041780).

Almost surely, 2^2105715561 is an apocalyptic number.

It is an amenable number.

2105715561 is a deficient number, since it is larger than the sum of its proper divisors (742952919).

2105715561 is a wasteful number, since it uses less digits than its factorization.

2105715561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21576.

The product of its (nonzero) digits is 10500, while the sum is 33.

The square root of 2105715561 is about 45888.0764578338. The cubic root of 2105715561 is about 1281.7398948474.

The spelling of 2105715561 in words is "two billion, one hundred five million, seven hundred fifteen thousand, five hundred sixty-one".