256135123 has 2 divisors, whose sum is σ = 256135124. Its totient is φ = 256135122.

The previous prime is 256135057. The next prime is 256135129. The reversal of 256135123 is 321531652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 256135123 - 2¹³ = 256126931 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 256135091 and 256135100.

It is not a weakly prime, because it can be changed into another prime (256135129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128067561 + 128067562.

It is an arithmetic number, because the mean of its divisors is an integer number (128067562).

Almost surely, 2^256135123 is an apocalyptic number.

256135123 is a deficient number, since it is larger than the sum of its proper divisors (1).

256135123 is an equidigital number, since it uses as much as digits as its factorization.

256135123 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5400, while the sum is 28.

The square root of 256135123 is about 16004.2220367002. Note that the first 3 decimals coincide. The cubic root of 256135123 is about 635.0721169669.

Adding to 256135123 its reverse (321531652), we get a palindrome (577666775).

The spelling of 256135123 in words is "two hundred fifty-six million, one hundred thirty-five thousand, one hundred twenty-three".