545423009 has 2 divisors, whose sum is σ = 545423010. Its totient is φ = 545423008.

The previous prime is 545422991. The next prime is 545423033. The reversal of 545423009 is 900324545.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 333865984 + 211557025 = 18272^2 + 14545^2 .

It is a cyclic number.

It is not a de Polignac number, because 545423009 - 2⁸ = 545422753 is a prime.

It is a super-2 number, since 2×545423009² = 594972517493228162, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is equal to p_28617701 and since 545423009 and 28617701 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (545426009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 272711504 + 272711505.

It is an arithmetic number, because the mean of its divisors is an integer number (272711505).

Almost surely, 2^545423009 is an apocalyptic number.

It is an amenable number.

545423009 is a deficient number, since it is larger than the sum of its proper divisors (1).

545423009 is an equidigital number, since it uses as much as digits as its factorization.

545423009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21600, while the sum is 32.

The square root of 545423009 is about 23354.2931599310. The cubic root of 545423009 is about 817.0421937722.

The spelling of 545423009 in words is "five hundred forty-five million, four hundred twenty-three thousand, nine".