653861 has 12 divisors (see below), whose sum is σ = 731268. Its totient is φ = 584064.

The previous prime is 653831. The next prime is 653879. The reversal of 653861 is 168356.

It can be written as a sum of positive squares in 6 ways, for example, as 37636 + 616225 = 194^2 + 785^2 .

It is not a de Polignac number, because 653861 - 2⁶ = 653797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 653861.

It is not an unprimeable number, because it can be changed into a prime (653801) 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 in 11 ways as a sum of consecutive naturals, for example, 8921 + ... + 8993.

It is an arithmetic number, because the mean of its divisors is an integer number (60939).

2⁶⁵³⁸⁶¹ is an apocalyptic number.

It is an amenable number.

653861 is a deficient number, since it is larger than the sum of its proper divisors (77407).

653861 is a wasteful number, since it uses less digits than its factorization.

653861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152 (or 139 counting only the distinct ones).

The product of its digits is 4320, while the sum is 29.

The square root of 653861 is about 808.6167200844. The cubic root of 653861 is about 86.7950873928.

The spelling of 653861 in words is "six hundred fifty-three thousand, eight hundred sixty-one".