2105378161 has 4 divisors (see below), whose sum is σ = 2105549424. Its totient is φ = 2105206900.

The previous prime is 2105378101. The next prime is 2105378173. The reversal of 2105378161 is 1618735012.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2105378161 - 2¹³ = 2105369969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2105378101) 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, 65635 + ... + 92296.

It is an arithmetic number, because the mean of its divisors is an integer number (526387356).

Almost surely, 2^2105378161 is an apocalyptic number.

It is an amenable number.

2105378161 is a deficient number, since it is larger than the sum of its proper divisors (171263).

2105378161 is a wasteful number, since it uses less digits than its factorization.

2105378161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171262.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 2105378161 is about 45884.3999742832. The cubic root of 2105378161 is about 1281.6714332204.

The spelling of 2105378161 in words is "two billion, one hundred five million, three hundred seventy-eight thousand, one hundred sixty-one".