2001209953 has 2 divisors, whose sum is σ = 2001209954. Its totient is φ = 2001209952.

The previous prime is 2001209923. The next prime is 2001209957. The reversal of 2001209953 is 3599021002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1649009664 + 352200289 = 40608^2 + 18767^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2001209953 is a prime.

It is not a weakly prime, because it can be changed into another prime (2001209957) 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, 1000604976 + 1000604977.

It is an arithmetic number, because the mean of its divisors is an integer number (1000604977).

Almost surely, 2^2001209953 is an apocalyptic number.

It is an amenable number.

2001209953 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001209953 is an equidigital number, since it uses as much as digits as its factorization.

2001209953 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4860, while the sum is 31.

The square root of 2001209953 is about 44734.8851904193. The cubic root of 2001209953 is about 1260.1750728848.

The spelling of 2001209953 in words is "two billion, one million, two hundred nine thousand, nine hundred fifty-three".