256054309 has 8 divisors (see below), whose sum is σ = 294269760. Its totient is φ = 218247936.

The previous prime is 256054297. The next prime is 256054321. The reversal of 256054309 is 903450652.

It is an interprime number because it is at equal distance from previous prime (256054297) and next prime (256054321).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 256054309 - 2⁷ = 256054181 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 (256054349) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 100924 + ... + 103429.

It is an arithmetic number, because the mean of its divisors is an integer number (36783720).

Almost surely, 2^256054309 is an apocalyptic number.

It is an amenable number.

256054309 is a deficient number, since it is larger than the sum of its proper divisors (38215451).

256054309 is a wasteful number, since it uses less digits than its factorization.

256054309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204539.

The product of its (nonzero) digits is 32400, while the sum is 34.

The square root of 256054309 is about 16001.6970662489. The cubic root of 256054309 is about 635.0053187394.

The spelling of 256054309 in words is "two hundred fifty-six million, fifty-four thousand, three hundred nine".