256020111 has 12 divisors (see below), whose sum is σ = 375870040. Its totient is φ = 167881680.

The previous prime is 256020109. The next prime is 256020133. The reversal of 256020111 is 111020652.

It is not a de Polignac number, because 256020111 - 2¹ = 256020109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256020101) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 232621 + ... + 233718.

Almost surely, 2^256020111 is an apocalyptic number.

256020111 is a deficient number, since it is larger than the sum of its proper divisors (119849929).

256020111 is a wasteful number, since it uses less digits than its factorization.

256020111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 466406 (or 466403 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 256020111 is about 16000.6284564076. The cubic root of 256020111 is about 634.9770475511.

Adding to 256020111 its reverse (111020652), we get a palindrome (367040763).

The spelling of 256020111 in words is "two hundred fifty-six million, twenty thousand, one hundred eleven".