256111321 has 4 divisors (see below), whose sum is σ = 257016592. Its totient is φ = 255206052.

The previous prime is 256111313. The next prime is 256111337. The reversal of 256111321 is 123111652.

It is a happy number.

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 not a de Polignac number, because 256111321 - 2³ = 256111313 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 256111292 and 256111301.

It is not an unprimeable number, because it can be changed into a prime (256111381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 452211 + ... + 452776.

It is an arithmetic number, because the mean of its divisors is an integer number (64254148).

Almost surely, 2^256111321 is an apocalyptic number.

It is an amenable number.

256111321 is a deficient number, since it is larger than the sum of its proper divisors (905271).

256111321 is an equidigital number, since it uses as much as digits as its factorization.

256111321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 905270.

The product of its digits is 360, while the sum is 22.

The square root of 256111321 is about 16003.4784031472. The cubic root of 256111321 is about 635.0524444667.

Adding to 256111321 its reverse (123111652), we get a palindrome (379222973).

The spelling of 256111321 in words is "two hundred fifty-six million, one hundred eleven thousand, three hundred twenty-one".