656291 has 2 divisors, whose sum is σ = 656292. Its totient is φ = 656290.

The previous prime is 656273. The next prime is 656297. The reversal of 656291 is 192656.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 656291 - 2¹⁰ = 655267 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a d-powerful number, because it can be written as 6² + 5⁷ + 2⁵ + 6⁶ + 9⁶ + 1 .

It is not a weakly prime, because it can be changed into another prime (656297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328145 + 328146.

It is an arithmetic number, because the mean of its divisors is an integer number (328146).

2⁶⁵⁶²⁹¹ is an apocalyptic number.

656291 is a deficient number, since it is larger than the sum of its proper divisors (1).

656291 is an equidigital number, since it uses as much as digits as its factorization.

656291 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3240, while the sum is 29.

The square root of 656291 is about 810.1178926551. The cubic root of 656291 is about 86.9024758253.

The spelling of 656291 in words is "six hundred fifty-six thousand, two hundred ninety-one".