256433641 has 4 divisors (see below), whose sum is σ = 258923392. Its totient is φ = 253943892.

The previous prime is 256433629. The next prime is 256433657. The reversal of 256433641 is 146334652.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 256433641 - 2⁵ = 256433609 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 256433597 and 256433606.

It is not an unprimeable number, because it can be changed into a prime (256433621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1244721 + ... + 1244926.

It is an arithmetic number, because the mean of its divisors is an integer number (64730848).

Almost surely, 2^256433641 is an apocalyptic number.

It is an amenable number.

256433641 is a deficient number, since it is larger than the sum of its proper divisors (2489751).

256433641 is a wasteful number, since it uses less digits than its factorization.

256433641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2489750.

The product of its digits is 51840, while the sum is 34.

The square root of 256433641 is about 16013.5455474420. The cubic root of 256433641 is about 635.3187405114.

The spelling of 256433641 in words is "two hundred fifty-six million, four hundred thirty-three thousand, six hundred forty-one".