545573261 has 2 divisors, whose sum is σ = 545573262. Its totient is φ = 545573260.

The previous prime is 545573257. The next prime is 545573263. The reversal of 545573261 is 162375545.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 415385161 + 130188100 = 20381^2 + 11410^2 .

It is a cyclic number.

It is not a de Polignac number, because 545573261 - 2² = 545573257 is a prime.

Together with 545573263, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (545573263) 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, 272786630 + 272786631.

It is an arithmetic number, because the mean of its divisors is an integer number (272786631).

Almost surely, 2^545573261 is an apocalyptic number.

It is an amenable number.

545573261 is a deficient number, since it is larger than the sum of its proper divisors (1).

545573261 is an equidigital number, since it uses as much as digits as its factorization.

545573261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 126000, while the sum is 38.

The square root of 545573261 is about 23357.5097345586. The cubic root of 545573261 is about 817.1172125806.

The spelling of 545573261 in words is "five hundred forty-five million, five hundred seventy-three thousand, two hundred sixty-one".