656142191 has 2 divisors, whose sum is σ = 656142192. Its totient is φ = 656142190.

The previous prime is 656142167. The next prime is 656142199. The reversal of 656142191 is 191241656.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 656142191 - 2²⁶ = 589033327 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (656142199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328071095 + 328071096.

It is an arithmetic number, because the mean of its divisors is an integer number (328071096).

Almost surely, 2^656142191 is an apocalyptic number.

656142191 is a deficient number, since it is larger than the sum of its proper divisors (1).

656142191 is an equidigital number, since it uses as much as digits as its factorization.

656142191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 35.

The square root of 656142191 is about 25615.2726122522. The cubic root of 656142191 is about 868.9590717004.

The spelling of 656142191 in words is "six hundred fifty-six million, one hundred forty-two thousand, one hundred ninety-one".