1989520513 has 2 divisors, whose sum is σ = 1989520514. Its totient is φ = 1989520512.

The previous prime is 1989520501. The next prime is 1989520529. The reversal of 1989520513 is 3150259891.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1495214224 + 494306289 = 38668^2 + 22233^2 .

It is a cyclic number.

It is not a de Polignac number, because 1989520513 - 2²⁵ = 1955966081 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1989520513.

It is not a weakly prime, because it can be changed into another prime (1989590513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 994760256 + 994760257.

It is an arithmetic number, because the mean of its divisors is an integer number (994760257).

Almost surely, 2^1989520513 is an apocalyptic number.

It is an amenable number.

1989520513 is a deficient number, since it is larger than the sum of its proper divisors (1).

1989520513 is an equidigital number, since it uses as much as digits as its factorization.

1989520513 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 97200, while the sum is 43.

The square root of 1989520513 is about 44604.0414424523. The cubic root of 1989520513 is about 1257.7166408434.

The spelling of 1989520513 in words is "one billion, nine hundred eighty-nine million, five hundred twenty thousand, five hundred thirteen".