2001989453 has 2 divisors, whose sum is σ = 2001989454. Its totient is φ = 2001989452.

The previous prime is 2001989447. The next prime is 2001989491. The reversal of 2001989453 is 3549891002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1692335044 + 309654409 = 41138^2 + 17597^2 .

It is a cyclic number.

It is not a de Polignac number, because 2001989453 - 2³⁰ = 928247629 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2001989453.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2001989443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000994726 + 1000994727.

It is an arithmetic number, because the mean of its divisors is an integer number (1000994727).

Almost surely, 2^2001989453 is an apocalyptic number.

It is an amenable number.

2001989453 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001989453 is an equidigital number, since it uses as much as digits as its factorization.

2001989453 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 77760, while the sum is 41.

The square root of 2001989453 is about 44743.5967821095. The cubic root of 2001989453 is about 1260.3386704048.

The spelling of 2001989453 in words is "two billion, one million, nine hundred eighty-nine thousand, four hundred fifty-three".