655291 has 16 divisors (see below), whose sum is σ = 851200. Its totient is φ = 489888.

The previous prime is 655289. The next prime is 655301. The reversal of 655291 is 192556.

It is not a de Polignac number, because 655291 - 2¹ = 655289 is a prime.

It is the 810-th Hogben number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655211) by changing a digit.

It is a nontrivial repunit in base 809.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1540 + ... + 1918.

It is an arithmetic number, because the mean of its divisors is an integer number (53200).

2⁶⁵⁵²⁹¹ is an apocalyptic number.

655291 is a deficient number, since it is larger than the sum of its proper divisors (195909).

655291 is a wasteful number, since it uses less digits than its factorization.

655291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 418.

The product of its digits is 2700, while the sum is 28.

The square root of 655291 is about 809.5004632488. The cubic root of 655291 is about 86.8583152058.

It can be divided in two parts, 655 and 291, that added together give a triangular number (946 = T₄₃).

The spelling of 655291 in words is "six hundred fifty-five thousand, two hundred ninety-one".