256532321 has 2 divisors, whose sum is σ = 256532322. Its totient is φ = 256532320.

The previous prime is 256532303. The next prime is 256532351. The reversal of 256532321 is 123235652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 212110096 + 44422225 = 14564^2 + 6665^2 .

It is a cyclic number.

It is not a de Polignac number, because 256532321 - 2¹⁴ = 256515937 is a prime.

It is not a weakly prime, because it can be changed into another prime (256532351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128266160 + 128266161.

It is an arithmetic number, because the mean of its divisors is an integer number (128266161).

Almost surely, 2^256532321 is an apocalyptic number.

It is an amenable number.

256532321 is a deficient number, since it is larger than the sum of its proper divisors (1).

256532321 is an equidigital number, since it uses as much as digits as its factorization.

256532321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10800, while the sum is 29.

The square root of 256532321 is about 16016.6263925959. The cubic root of 256532321 is about 635.4002238573.

Adding to 256532321 its reverse (123235652), we get a palindrome (379767973).

The spelling of 256532321 in words is "two hundred fifty-six million, five hundred thirty-two thousand, three hundred twenty-one".