2001303509 has 2 divisors, whose sum is σ = 2001303510. Its totient is φ = 2001303508.

The previous prime is 2001303449. The next prime is 2001303559. The reversal of 2001303509 is 9053031002.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1082607409 + 918696100 = 32903^2 + 30310^2 .

It is a cyclic number.

It is not a de Polignac number, because 2001303509 - 2²⁴ = 1984526293 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2001303559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000651754 + 1000651755.

It is an arithmetic number, because the mean of its divisors is an integer number (1000651755).

Almost surely, 2^2001303509 is an apocalyptic number.

It is an amenable number.

2001303509 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001303509 is an equidigital number, since it uses as much as digits as its factorization.

2001303509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 810, while the sum is 23.

The square root of 2001303509 is about 44735.9308498214. The cubic root of 2001303509 is about 1260.1947101883.

The spelling of 2001303509 in words is "two billion, one million, three hundred three thousand, five hundred nine".