653791 has 4 divisors (see below), whose sum is σ = 661752. Its totient is φ = 645832.

The previous prime is 653789. The next prime is 653797. The reversal of 653791 is 197356.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 653791 - 2¹ = 653789 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 (653797) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3856 + ... + 4021.

It is an arithmetic number, because the mean of its divisors is an integer number (165438).

2⁶⁵³⁷⁹¹ is an apocalyptic number.

653791 is a deficient number, since it is larger than the sum of its proper divisors (7961).

653791 is an equidigital number, since it uses as much as digits as its factorization.

653791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7960.

The product of its digits is 5670, while the sum is 31.

The square root of 653791 is about 808.5734351313. The cubic root of 653791 is about 86.7919899593.

It can be divided in two parts, 653 and 791, that added together give a square (1444 = 38²).

The spelling of 653791 in words is "six hundred fifty-three thousand, seven hundred ninety-one".