1572256321 has 2 divisors, whose sum is σ = 1572256322. Its totient is φ = 1572256320.

The previous prime is 1572256307. The next prime is 1572256363. The reversal of 1572256321 is 1236522751.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1181640625 + 390615696 = 34375^2 + 19764^2 .

It is an emirp because it is prime and its reverse (1236522751) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1572256321 - 2¹¹ = 1572254273 is a prime.

It is not a weakly prime, because it can be changed into another prime (1572256121) 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, 786128160 + 786128161.

It is an arithmetic number, because the mean of its divisors is an integer number (786128161).

Almost surely, 2^1572256321 is an apocalyptic number.

It is an amenable number.

1572256321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1572256321 is an equidigital number, since it uses as much as digits as its factorization.

1572256321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25200, while the sum is 34.

The square root of 1572256321 is about 39651.6874924637. The cubic root of 1572256321 is about 1162.8073898805.

The spelling of 1572256321 in words is "one billion, five hundred seventy-two million, two hundred fifty-six thousand, three hundred twenty-one".