545220989 has 4 divisors (see below), whose sum is σ = 554159100. Its totient is φ = 536282880.

The previous prime is 545220983. The next prime is 545221021. The reversal of 545220989 is 989022545.

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 25836889 + 519384100 = 5083^2 + 22790^2 .

It is a cyclic number.

It is not a de Polignac number, because 545220989 - 2²⁸ = 276785533 is a prime.

It is a super-2 number, since 2×545220989² = 594531853692276242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (545220983) 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, 4468964 + ... + 4469085.

It is an arithmetic number, because the mean of its divisors is an integer number (138539775).

Almost surely, 2^545220989 is an apocalyptic number.

It is an amenable number.

545220989 is a deficient number, since it is larger than the sum of its proper divisors (8938111).

545220989 is an equidigital number, since it uses as much as digits as its factorization.

545220989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8938110.

The product of its (nonzero) digits is 259200, while the sum is 44.

The square root of 545220989 is about 23349.9676445172. The cubic root of 545220989 is about 816.9413061771.

The spelling of 545220989 in words is "five hundred forty-five million, two hundred twenty thousand, nine hundred eighty-nine".