2105800465 has 4 divisors (see below), whose sum is σ = 2526960564. Its totient is φ = 1684640368.

The previous prime is 2105800441. The next prime is 2105800469. The reversal of 2105800465 is 5640085012.

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

It can be written as a sum of positive squares in 2 ways, for example, as 758616849 + 1347183616 = 27543^2 + 36704^2 .

It is a cyclic number.

It is not a de Polignac number, because 2105800465 - 2⁹ = 2105799953 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2105800469) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 210580042 + ... + 210580051.

It is an arithmetic number, because the mean of its divisors is an integer number (631740141).

Almost surely, 2^2105800465 is an apocalyptic number.

It is an amenable number.

2105800465 is a deficient number, since it is larger than the sum of its proper divisors (421160099).

2105800465 is an equidigital number, since it uses as much as digits as its factorization.

2105800465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421160098.

The product of its (nonzero) digits is 9600, while the sum is 31.

The square root of 2105800465 is about 45889.0015690034. The cubic root of 2105800465 is about 1281.7571215143.

Adding to 2105800465 its reverse (5640085012), we get a palindrome (7745885477).

The spelling of 2105800465 in words is "two billion, one hundred five million, eight hundred thousand, four hundred sixty-five".