256109193 has 6 divisors (see below), whose sum is σ = 369935514. Its totient is φ = 170739456.

The previous prime is 256109177. The next prime is 256109201. The reversal of 256109193 is 391901652.

256109193 is a `hidden beast` number, since 2 + 561 + 0 + 9 + 1 + 93 = 666.

It can be written as a sum of positive squares in only one way, i.e., 235561104 + 20548089 = 15348^2 + 4533^2 .

It is not a de Polignac number, because 256109193 - 2⁴ = 256109177 is a prime.

It is a super-2 number, since 2×256109193² = 131183837478222498, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (256109123) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14228280 + ... + 14228297.

It is an arithmetic number, because the mean of its divisors is an integer number (61655919).

Almost surely, 2^256109193 is an apocalyptic number.

It is an amenable number.

256109193 is a deficient number, since it is larger than the sum of its proper divisors (113826321).

256109193 is a wasteful number, since it uses less digits than its factorization.

256109193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28456583 (or 28456580 counting only the distinct ones).

The product of its (nonzero) digits is 14580, while the sum is 36.

The square root of 256109193 is about 16003.4119174631. The cubic root of 256109193 is about 635.0506856022.

The spelling of 256109193 in words is "two hundred fifty-six million, one hundred nine thousand, one hundred ninety-three".