654191 has 2 divisors, whose sum is σ = 654192. Its totient is φ = 654190.

The previous prime is 654187. The next prime is 654209. The reversal of 654191 is 191456.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 654191 - 2² = 654187 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 654191.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (654161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327095 + 327096.

It is an arithmetic number, because the mean of its divisors is an integer number (327096).

2⁶⁵⁴¹⁹¹ is an apocalyptic number.

654191 is a deficient number, since it is larger than the sum of its proper divisors (1).

654191 is an equidigital number, since it uses as much as digits as its factorization.

654191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1080, while the sum is 26.

The square root of 654191 is about 808.8207465193. The cubic root of 654191 is about 86.8096866026.

The spelling of 654191 in words is "six hundred fifty-four thousand, one hundred ninety-one".