2001653 has 2 divisors, whose sum is σ = 2001654. Its totient is φ = 2001652.

The previous prime is 2001641. The next prime is 2001673. The reversal of 2001653 is 3561002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1493284 + 508369 = 1222^2 + 713^2 .

It is a cyclic number.

It is not a de Polignac number, because 2001653 - 2⁸ = 2001397 is a prime.

It is a super-2 number, since 2×2001653² = 8013229464818, 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 (2001673) 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, 1000826 + 1000827.

It is an arithmetic number, because the mean of its divisors is an integer number (1000827).

2^2001653 is an apocalyptic number.

It is an amenable number.

2001653 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001653 is an equidigital number, since it uses as much as digits as its factorization.

2001653 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 2001653 is about 1414.7978654211. The cubic root of 2001653 is about 126.0268062560.

Adding to 2001653 its reverse (3561002), we get a palindrome (5562655).

The spelling of 2001653 in words is "two million, one thousand, six hundred fifty-three".