256434231 has 4 divisors (see below), whose sum is σ = 341912312. Its totient is φ = 170956152.

The previous prime is 256434229. The next prime is 256434257. The reversal of 256434231 is 132434652.

256434231 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.

It is not a de Polignac number, because 256434231 - 2¹ = 256434229 is a prime.

It is a super-3 number, since 3×256434231³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256434221) 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, 42739036 + ... + 42739041.

It is an arithmetic number, because the mean of its divisors is an integer number (85478078).

Almost surely, 2^256434231 is an apocalyptic number.

256434231 is a deficient number, since it is larger than the sum of its proper divisors (85478081).

256434231 is an equidigital number, since it uses as much as digits as its factorization.

256434231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85478080.

The product of its digits is 17280, while the sum is 30.

The square root of 256434231 is about 16013.5639693355. The cubic root of 256434231 is about 635.3192277561.

Adding to 256434231 its reverse (132434652), we get a palindrome (388868883).

The spelling of 256434231 in words is "two hundred fifty-six million, four hundred thirty-four thousand, two hundred thirty-one".