545309217 has 6 divisors (see below), whose sum is σ = 787668882. Its totient is φ = 363539472.

The previous prime is 545309213. The next prime is 545309257. The reversal of 545309217 is 712903545.

It can be written as a sum of positive squares in only one way, i.e., 384120801 + 161188416 = 19599^2 + 12696^2 .

It is not a de Polignac number, because 545309217 - 2² = 545309213 is a prime.

It is not an unprimeable number, because it can be changed into a prime (545309213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 30294948 + ... + 30294965.

It is an arithmetic number, because the mean of its divisors is an integer number (131278147).

Almost surely, 2^545309217 is an apocalyptic number.

It is an amenable number.

545309217 is a deficient number, since it is larger than the sum of its proper divisors (242359665).

545309217 is a wasteful number, since it uses less digits than its factorization.

545309217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60589919 (or 60589916 counting only the distinct ones).

The product of its (nonzero) digits is 37800, while the sum is 36.

The square root of 545309217 is about 23351.8568212466. The cubic root of 545309217 is about 816.9853697841.

The spelling of 545309217 in words is "five hundred forty-five million, three hundred nine thousand, two hundred seventeen".