2045394217 has 4 divisors (see below), whose sum is σ = 2045488900. Its totient is φ = 2045299536.

The previous prime is 2045394139. The next prime is 2045394259. The reversal of 2045394217 is 7124935402.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1996659856 + 48734361 = 44684^2 + 6981^2 .

It is a cyclic number.

It is not a de Polignac number, because 2045394217 - 2¹¹ = 2045392169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2045394017) 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, 2683 + ... + 64015.

It is an arithmetic number, because the mean of its divisors is an integer number (511372225).

Almost surely, 2^2045394217 is an apocalyptic number.

It is an amenable number.

2045394217 is a deficient number, since it is larger than the sum of its proper divisors (94683).

2045394217 is an equidigital number, since it uses as much as digits as its factorization.

2045394217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94682.

The product of its (nonzero) digits is 60480, while the sum is 37.

The square root of 2045394217 is about 45226.0347255870. The cubic root of 2045394217 is about 1269.3820162817.

The spelling of 2045394217 in words is "two billion, forty-five million, three hundred ninety-four thousand, two hundred seventeen".