573661 has 8 divisors (see below), whose sum is σ = 632448. Its totient is φ = 520300.

The previous prime is 573647. The next prime is 573673. The reversal of 573661 is 166375.

It is not a de Polignac number, because 573661 - 2¹³ = 565469 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (573691) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1116 + ... + 1546.

It is an arithmetic number, because the mean of its divisors is an integer number (79056).

2⁵⁷³⁶⁶¹ is an apocalyptic number.

It is an amenable number.

573661 is a deficient number, since it is larger than the sum of its proper divisors (58787).

573661 is an equidigital number, since it uses as much as digits as its factorization.

573661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 464 (or 442 counting only the distinct ones).

The product of its digits is 3780, while the sum is 28.

The square root of 573661 is about 757.4041193445. The cubic root of 573661 is about 83.0905770750.

The spelling of 573661 in words is "five hundred seventy-three thousand, six hundred sixty-one".