256211093 has 4 divisors (see below), whose sum is σ = 259720908. Its totient is φ = 252701280.

The previous prime is 256211057. The next prime is 256211159. The reversal of 256211093 is 390112652.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 131285764 + 124925329 = 11458^2 + 11177^2 .

It is a cyclic number.

It is not a de Polignac number, because 256211093 - 2¹⁰ = 256210069 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 (256211003) 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, 1754798 + ... + 1754943.

It is an arithmetic number, because the mean of its divisors is an integer number (64930227).

Almost surely, 2^256211093 is an apocalyptic number.

It is an amenable number.

256211093 is a deficient number, since it is larger than the sum of its proper divisors (3509815).

256211093 is an equidigital number, since it uses as much as digits as its factorization.

256211093 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3509814.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 256211093 is about 16006.5952969393. The cubic root of 256211093 is about 635.1348984902.

The spelling of 256211093 in words is "two hundred fifty-six million, two hundred eleven thousand, ninety-three".