256021499 has 2 divisors, whose sum is σ = 256021500. Its totient is φ = 256021498.

The previous prime is 256021433. The next prime is 256021511. The reversal of 256021499 is 994120652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 256021499 - 2¹⁶ = 255955963 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (256011499) 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 as a sum of consecutive naturals, namely, 128010749 + 128010750.

It is an arithmetic number, because the mean of its divisors is an integer number (128010750).

Almost surely, 2^256021499 is an apocalyptic number.

256021499 is a deficient number, since it is larger than the sum of its proper divisors (1).

256021499 is an equidigital number, since it uses as much as digits as its factorization.

256021499 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 256021499 is about 16000.6718296452. The cubic root of 256021499 is about 634.9781950477.

The spelling of 256021499 in words is "two hundred fifty-six million, twenty-one thousand, four hundred ninety-nine".