2105115547 has 4 divisors (see below), whose sum is σ = 2105589816. Its totient is φ = 2104641280.

The previous prime is 2105115517. The next prime is 2105115557. The reversal of 2105115547 is 7455115012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2105115547 is a prime.

It is a super-2 number, since 2×2105115547² = 8863022932442218418, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2105115517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 230413 + ... + 239374.

It is an arithmetic number, because the mean of its divisors is an integer number (526397454).

Almost surely, 2^2105115547 is an apocalyptic number.

2105115547 is a deficient number, since it is larger than the sum of its proper divisors (474269).

2105115547 is an equidigital number, since it uses as much as digits as its factorization.

2105115547 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 474268.

The product of its (nonzero) digits is 7000, while the sum is 31.

The square root of 2105115547 is about 45881.5381934826. The cubic root of 2105115547 is about 1281.6181413124.

The spelling of 2105115547 in words is "two billion, one hundred five million, one hundred fifteen thousand, five hundred forty-seven".