545521 has 2 divisors, whose sum is σ = 545522. Its totient is φ = 545520.

The previous prime is 545497. The next prime is 545527. The reversal of 545521 is 125545.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 505521 + 40000 = 711^2 + 200^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-545521 is a prime.

It is a super-2 number, since 2×545521² = 595186322882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 545492 and 545501.

It is not a weakly prime, because it can be changed into another prime (545527) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 272760 + 272761.

It is an arithmetic number, because the mean of its divisors is an integer number (272761).

2⁵⁴⁵⁵²¹ is an apocalyptic number.

It is an amenable number.

545521 is a deficient number, since it is larger than the sum of its proper divisors (1).

545521 is an equidigital number, since it uses as much as digits as its factorization.

545521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1000, while the sum is 22.

The square root of 545521 is about 738.5939344457. The cubic root of 545521 is about 81.7091120927.

It can be divided in two parts, 5455 and 21, that added together give a square (5476 = 74²).

The spelling of 545521 in words is "five hundred forty-five thousand, five hundred twenty-one".