256021433 has 2 divisors, whose sum is σ = 256021434. Its totient is φ = 256021432.

The previous prime is 256021417. The next prime is 256021499. The reversal of 256021433 is 334120652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 244515769 + 11505664 = 15637^2 + 3392^2 .

It is a cyclic number.

It is not a de Polignac number, because 256021433 - 2⁴ = 256021417 is a prime.

It is not a weakly prime, because it can be changed into another prime (256081433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128010716 + 128010717.

It is an arithmetic number, because the mean of its divisors is an integer number (128010717).

Almost surely, 2^256021433 is an apocalyptic number.

It is an amenable number.

256021433 is a deficient number, since it is larger than the sum of its proper divisors (1).

256021433 is an equidigital number, since it uses as much as digits as its factorization.

256021433 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 26.

The square root of 256021433 is about 16000.6697672316. The cubic root of 256021433 is about 634.9781404838.

The spelling of 256021433 in words is "two hundred fifty-six million, twenty-one thousand, four hundred thirty-three".