656332189 has 2 divisors, whose sum is σ = 656332190. Its totient is φ = 656332188.

The previous prime is 656332153. The next prime is 656332199. The reversal of 656332189 is 981233656.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 507736089 + 148596100 = 22533^2 + 12190^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-656332189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (656332199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328166094 + 328166095.

It is an arithmetic number, because the mean of its divisors is an integer number (328166095).

Almost surely, 2^656332189 is an apocalyptic number.

It is an amenable number.

656332189 is a deficient number, since it is larger than the sum of its proper divisors (1).

656332189 is an equidigital number, since it uses as much as digits as its factorization.

656332189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 233280, while the sum is 43.

The square root of 656332189 is about 25618.9810296975. The cubic root of 656332189 is about 869.0429379490.

The spelling of 656332189 in words is "six hundred fifty-six million, three hundred thirty-two thousand, one hundred eighty-nine".