545500421 has 2 divisors, whose sum is σ = 545500422. Its totient is φ = 545500420.

The previous prime is 545500409. The next prime is 545500429. The reversal of 545500421 is 124005545.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 495952900 + 49547521 = 22270^2 + 7039^2 .

It is a cyclic number.

It is not a de Polignac number, because 545500421 - 2¹⁸ = 545238277 is a prime.

It is a super-2 number, since 2×545500421² = 595141418622354482, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (545500429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 272750210 + 272750211.

It is an arithmetic number, because the mean of its divisors is an integer number (272750211).

Almost surely, 2^545500421 is an apocalyptic number.

It is an amenable number.

545500421 is a deficient number, since it is larger than the sum of its proper divisors (1).

545500421 is an equidigital number, since it uses as much as digits as its factorization.

545500421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4000, while the sum is 26.

The square root of 545500421 is about 23355.9504409476. The cubic root of 545500421 is about 817.0808462659.

Adding to 545500421 its reverse (124005545), we get a palindrome (669505966).

The spelling of 545500421 in words is "five hundred forty-five million, five hundred thousand, four hundred twenty-one".