2145521617 has 4 divisors (see below), whose sum is σ = 2162415616. Its totient is φ = 2128627620.

The previous prime is 2145521603. The next prime is 2145521647. The reversal of 2145521617 is 7161255412.

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 2145521617 - 2¹¹ = 2145519569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2145521647) 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, 8446809 + ... + 8447062.

It is an arithmetic number, because the mean of its divisors is an integer number (540603904).

Almost surely, 2^2145521617 is an apocalyptic number.

It is an amenable number.

2145521617 is a deficient number, since it is larger than the sum of its proper divisors (16893999).

2145521617 is a wasteful number, since it uses less digits than its factorization.

2145521617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16893998.

The product of its digits is 16800, while the sum is 34.

The square root of 2145521617 is about 46319.7756579196. The cubic root of 2145521617 is about 1289.7661208914.

The spelling of 2145521617 in words is "two billion, one hundred forty-five million, five hundred twenty-one thousand, six hundred seventeen".