1645054013 has 4 divisors (see below), whose sum is σ = 1645256028. Its totient is φ = 1644852000.

The previous prime is 1645053983. The next prime is 1645054031. The reversal of 1645054013 is 3104505461.

It is a happy number.

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 750924409 + 894129604 = 27403^2 + 29902^2 .

It is a cyclic number.

It is not a de Polignac number, because 1645054013 - 2⁸ = 1645053757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1645054043) 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 3 ways as a sum of consecutive naturals, for example, 88256 + ... + 105257.

It is an arithmetic number, because the mean of its divisors is an integer number (411314007).

Almost surely, 2^1645054013 is an apocalyptic number.

It is an amenable number.

1645054013 is a deficient number, since it is larger than the sum of its proper divisors (202015).

1645054013 is an equidigital number, since it uses as much as digits as its factorization.

1645054013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202014.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 1645054013 is about 40559.2654396009. The cubic root of 1645054013 is about 1180.4838609827.

Adding to 1645054013 its reverse (3104505461), we get a palindrome (4749559474).

The spelling of 1645054013 in words is "one billion, six hundred forty-five million, fifty-four thousand, thirteen".