256020197 has 2 divisors, whose sum is σ = 256020198. Its totient is φ = 256020196.

The previous prime is 256020161. The next prime is 256020209. The reversal of 256020197 is 791020652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 132388036 + 123632161 = 11506^2 + 11119^2 .

It is a cyclic number.

It is not a de Polignac number, because 256020197 - 2⁶ = 256020133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256020137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128010098 + 128010099.

It is an arithmetic number, because the mean of its divisors is an integer number (128010099).

Almost surely, 2^256020197 is an apocalyptic number.

It is an amenable number.

256020197 is a deficient number, since it is larger than the sum of its proper divisors (1).

256020197 is an equidigital number, since it uses as much as digits as its factorization.

256020197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 256020197 is about 16000.6311438018. The cubic root of 256020197 is about 634.9771186498.

The spelling of 256020197 in words is "two hundred fifty-six million, twenty thousand, one hundred ninety-seven".