2001533 has 2 divisors, whose sum is σ = 2001534. Its totient is φ = 2001532.

The previous prime is 2001511. The next prime is 2001539. The reversal of 2001533 is 3351002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1968409 + 33124 = 1403^2 + 182^2 .

It is a cyclic number.

It is not a de Polignac number, because 2001533 - 2⁶ = 2001469 is a prime.

It is a super-2 number, since 2×2001533² = 8012268700178, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2001539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000766 + 1000767.

It is an arithmetic number, because the mean of its divisors is an integer number (1000767).

2^2001533 is an apocalyptic number.

It is an amenable number.

2001533 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001533 is an equidigital number, since it uses as much as digits as its factorization.

2001533 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90, while the sum is 14.

The square root of 2001533 is about 1414.7554559004. The cubic root of 2001533 is about 126.0242877510.

Adding to 2001533 its reverse (3351002), we get a palindrome (5352535).

The spelling of 2001533 in words is "two million, one thousand, five hundred thirty-three".