256260181 has 4 divisors (see below), whose sum is σ = 267401952. Its totient is φ = 245118412.

The previous prime is 256260143. The next prime is 256260197. The reversal of 256260181 is 181062652.

256260181 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256260181 is a prime.

It is a super-2 number, since 2×256260181² = 131338560732305522, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256260131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5570851 + ... + 5570896.

It is an arithmetic number, because the mean of its divisors is an integer number (66850488).

Almost surely, 2^256260181 is an apocalyptic number.

It is an amenable number.

256260181 is a deficient number, since it is larger than the sum of its proper divisors (11141771).

256260181 is a wasteful number, since it uses less digits than its factorization.

256260181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11141770.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 256260181 is about 16008.1285914375. The cubic root of 256260181 is about 635.1754581587.

The spelling of 256260181 in words is "two hundred fifty-six million, two hundred sixty thousand, one hundred eighty-one".