655655191 has 2 divisors, whose sum is σ = 655655192. Its totient is φ = 655655190.

The previous prime is 655655179. The next prime is 655655213. The reversal of 655655191 is 191556556.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 655655191 - 2⁵ = 655655159 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (655655491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327827595 + 327827596.

It is an arithmetic number, because the mean of its divisors is an integer number (327827596).

Almost surely, 2^655655191 is an apocalyptic number.

655655191 is a deficient number, since it is larger than the sum of its proper divisors (1).

655655191 is an equidigital number, since it uses as much as digits as its factorization.

655655191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 202500, while the sum is 43.

The square root of 655655191 is about 25605.7648001383. The cubic root of 655655191 is about 868.7440330422.

It can be divided in two parts, 65565 and 5191, that added together give a square (70756 = 266²).

The spelling of 655655191 in words is "six hundred fifty-five million, six hundred fifty-five thousand, one hundred ninety-one".