545456309 has 2 divisors, whose sum is σ = 545456310. Its totient is φ = 545456308.

The previous prime is 545456297. The next prime is 545456323. The reversal of 545456309 is 903654545.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 541865284 + 3591025 = 23278^2 + 1895^2 .

It is a cyclic number.

It is not a de Polignac number, because 545456309 - 2²⁴ = 528679093 is a prime.

It is a Sophie Germain prime.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (545456909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 272728154 + 272728155.

It is an arithmetic number, because the mean of its divisors is an integer number (272728155).

Almost surely, 2^545456309 is an apocalyptic number.

It is an amenable number.

545456309 is a deficient number, since it is larger than the sum of its proper divisors (1).

545456309 is an equidigital number, since it uses as much as digits as its factorization.

545456309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324000, while the sum is 41.

The square root of 545456309 is about 23355.0060800677. The cubic root of 545456309 is about 817.0588212038.

The spelling of 545456309 in words is "five hundred forty-five million, four hundred fifty-six thousand, three hundred nine".