256020101 has 2 divisors, whose sum is σ = 256020102. Its totient is φ = 256020100.

The previous prime is 256020073. The next prime is 256020109. The reversal of 256020101 is 101020652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 156000100 + 100020001 = 12490^2 + 10001^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256020101 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 256020101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256020109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128010050 + 128010051.

It is an arithmetic number, because the mean of its divisors is an integer number (128010051).

Almost surely, 2^256020101 is an apocalyptic number.

It is an amenable number.

256020101 is a deficient number, since it is larger than the sum of its proper divisors (1).

256020101 is an equidigital number, since it uses as much as digits as its factorization.

256020101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 256020101 is about 16000.6281439199. The cubic root of 256020101 is about 634.9770392839.

Adding to 256020101 its reverse (101020652), we get a palindrome (357040753).

The spelling of 256020101 in words is "two hundred fifty-six million, twenty thousand, one hundred one".