545221013 has 4 divisors (see below), whose sum is σ = 552689868. Its totient is φ = 537752160.

The previous prime is 545220983. The next prime is 545221021. The reversal of 545221013 is 310122545.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 310122545 = 5 ⋅62024509.

It can be written as a sum of positive squares in 2 ways, for example, as 192044164 + 353176849 = 13858^2 + 18793^2 .

It is a cyclic number.

It is not a de Polignac number, because 545221013 - 2⁸ = 545220757 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 545221013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (545221213) 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, 3734318 + ... + 3734463.

It is an arithmetic number, because the mean of its divisors is an integer number (138172467).

Almost surely, 2^545221013 is an apocalyptic number.

It is an amenable number.

545221013 is a deficient number, since it is larger than the sum of its proper divisors (7468855).

545221013 is an equidigital number, since it uses as much as digits as its factorization.

545221013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7468854.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 545221013 is about 23349.9681584365. The cubic root of 545221013 is about 816.9413181641.

Adding to 545221013 its reverse (310122545), we get a palindrome (855343558).

The spelling of 545221013 in words is "five hundred forty-five million, two hundred twenty-one thousand, thirteen".