603561 has 16 divisors (see below), whose sum is σ = 943488. Its totient is φ = 336000.

The previous prime is 603557. The next prime is 603563. The reversal of 603561 is 165306.

603561 = T₇₈ + T₇₉ + ... + T₁₅₉.

603561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 603561 - 2² = 603557 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a zygodrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (603563) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 511 + ... + 1211.

It is an arithmetic number, because the mean of its divisors is an integer number (58968).

2⁶⁰³⁵⁶¹ is an apocalyptic number.

It is an amenable number.

603561 is a deficient number, since it is larger than the sum of its proper divisors (339927).

603561 is a wasteful number, since it uses less digits than its factorization.

603561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 752.

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 603561 is about 776.8918843700. The cubic root of 603561 is about 84.5097966070.

Adding to 603561 its reverse (165306), we get a palindrome (768867).

The spelling of 603561 in words is "six hundred three thousand, five hundred sixty-one".