654291 has 16 divisors (see below), whose sum is σ = 1057920. Its totient is φ = 396360.

The previous prime is 654257. The next prime is 654293. The reversal of 654291 is 192456.

654291 is a `hidden beast` number, since 654 + 2 + 9 + 1 = 666.

654291 is nontrivially palindromic in base 5.

It is not a de Polignac number, because 654291 - 2⁷ = 654163 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (654293) 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, 805 + ... + 1398.

It is an arithmetic number, because the mean of its divisors is an integer number (66120).

2⁶⁵⁴²⁹¹ is an apocalyptic number.

654291 is a deficient number, since it is larger than the sum of its proper divisors (403629).

654291 is a wasteful number, since it uses less digits than its factorization.

654291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2223 (or 2217 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 654291 is about 808.8825625516. The cubic root of 654291 is about 86.8141096362.

It can be divided in two parts, 65 and 4291, that added together give a square (4356 = 66²).

The spelling of 654291 in words is "six hundred fifty-four thousand, two hundred ninety-one".