1999513 has 2 divisors, whose sum is σ = 1999514. Its totient is φ = 1999512.

The previous prime is 1999511. The next prime is 1999537. The reversal of 1999513 is 3159991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1054729 + 944784 = 1027^2 + 972^2 .

It is an emirp because it is prime and its reverse (3159991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1999513 - 2¹ = 1999511 is a prime.

Together with 1999511, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1999511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 999756 + 999757.

It is an arithmetic number, because the mean of its divisors is an integer number (999757).

2^1999513 is an apocalyptic number.

It is an amenable number.

1999513 is a deficient number, since it is larger than the sum of its proper divisors (1).

1999513 is an equidigital number, since it uses as much as digits as its factorization.

1999513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10935, while the sum is 37.

The square root of 1999513 is about 1414.0413713891. The cubic root of 1999513 is about 125.9818778001.

The spelling of 1999513 in words is "one million, nine hundred ninety-nine thousand, five hundred thirteen".