256431235 has 16 divisors (see below), whose sum is σ = 313776000. Its totient is φ = 201142656.

The previous prime is 256431221. The next prime is 256431269. The reversal of 256431235 is 532134652.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 256431235 - 2¹³ = 256423043 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 256431197 and 256431206.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56677 + ... + 61033.

It is an arithmetic number, because the mean of its divisors is an integer number (19611000).

Almost surely, 2^256431235 is an apocalyptic number.

256431235 is a deficient number, since it is larger than the sum of its proper divisors (57344765).

256431235 is a wasteful number, since it uses less digits than its factorization.

256431235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4590.

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

The square root of 256431235 is about 16013.4704233654. The cubic root of 256431235 is about 635.3167535365.

Adding to 256431235 its reverse (532134652), we get a palindrome (788565887).

The spelling of 256431235 in words is "two hundred fifty-six million, four hundred thirty-one thousand, two hundred thirty-five".