1533221801 has 2 divisors, whose sum is σ = 1533221802. Its totient is φ = 1533221800.

The previous prime is 1533221759. The next prime is 1533221831. The reversal of 1533221801 is 1081223351.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1532644201 + 577600 = 39149^2 + 760^2 .

It is a cyclic number.

It is not a de Polignac number, because 1533221801 - 2¹⁴ = 1533205417 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1533221831) 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, 766610900 + 766610901.

It is an arithmetic number, because the mean of its divisors is an integer number (766610901).

Almost surely, 2^1533221801 is an apocalyptic number.

It is an amenable number.

1533221801 is a deficient number, since it is larger than the sum of its proper divisors (1).

1533221801 is an equidigital number, since it uses as much as digits as its factorization.

1533221801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 1533221801 is about 39156.3762495969. The cubic root of 1533221801 is about 1153.1036016436.

The spelling of 1533221801 in words is "one billion, five hundred thirty-three million, two hundred twenty-one thousand, eight hundred one".