553561 has 2 divisors, whose sum is σ = 553562. Its totient is φ = 553560.

The previous prime is 553549. The next prime is 553573. The reversal of 553561 is 165355.

It is a balanced prime because it is at equal distance from previous prime (553549) and next prime (553573).

It can be written as a sum of positive squares in only one way, i.e., 553536 + 25 = 744^2 + 5^2 .

It is a cyclic number.

It is not a de Polignac number, because 553561 - 2⁵ = 553529 is a prime.

It is an Ulam number.

It is equal to p₄₅₅₉₂ and since 553561 and 45592 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 (553591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 276780 + 276781.

It is an arithmetic number, because the mean of its divisors is an integer number (276781).

2⁵⁵³⁵⁶¹ is an apocalyptic number.

It is an amenable number.

553561 is a deficient number, since it is larger than the sum of its proper divisors (1).

553561 is an equidigital number, since it uses as much as digits as its factorization.

553561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2250, while the sum is 25.

The square root of 553561 is about 744.0168008856. The cubic root of 553561 is about 82.1085712345.

Subtracting from 553561 its sum of digits (25), we obtain a square (553536 = 744²).

The spelling of 553561 in words is "five hundred fifty-three thousand, five hundred sixty-one".