2221519945 has 8 divisors (see below), whose sum is σ = 2666719944. Its totient is φ = 1776618624.

The previous prime is 2221519943. The next prime is 2221519967. The reversal of 2221519945 is 5499151222.

It can be written as a sum of positive squares in 4 ways, for example, as 126810121 + 2094709824 = 11261^2 + 45768^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2221519945 - 2¹ = 2221519943 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2221519898 and 2221519907.

It is not an unprimeable number, because it can be changed into a prime (2221519943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57964 + ... + 88333.

It is an arithmetic number, because the mean of its divisors is an integer number (333339993).

Almost surely, 2^2221519945 is an apocalyptic number.

It is an amenable number.

2221519945 is a deficient number, since it is larger than the sum of its proper divisors (445199999).

2221519945 is a wasteful number, since it uses less digits than its factorization.

2221519945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149339.

The product of its digits is 64800, while the sum is 40.

The square root of 2221519945 is about 47133.0027157193. The cubic root of 2221519945 is about 1304.8183997876.

The spelling of 2221519945 in words is "two billion, two hundred twenty-one million, five hundred nineteen thousand, nine hundred forty-five".