256135234 has 4 divisors (see below), whose sum is σ = 384202854. Its totient is φ = 128067616.

The previous prime is 256135213. The next prime is 256135259. The reversal of 256135234 is 432531652.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 233998209 + 22137025 = 15297^2 + 4705^2 .

It is a junction number, because it is equal to n+sod(n) for n = 256135196 and 256135205.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64033807 + ... + 64033810.

Almost surely, 2^256135234 is an apocalyptic number.

256135234 is a deficient number, since it is larger than the sum of its proper divisors (128067620).

256135234 is a wasteful number, since it uses less digits than its factorization.

256135234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128067619.

The product of its digits is 21600, while the sum is 31.

The square root of 256135234 is about 16004.2255045347. The cubic root of 256135234 is about 635.0722087063.

Adding to 256135234 its reverse (432531652), we get a palindrome (688666886).

The spelling of 256135234 in words is "two hundred fifty-six million, one hundred thirty-five thousand, two hundred thirty-four".