1988513 has 2 divisors, whose sum is σ = 1988514. Its totient is φ = 1988512.

The previous prime is 1988471. The next prime is 1988531. The reversal of 1988513 is 3158891.

Together with next prime (1988531) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1607824 + 380689 = 1268^2 + 617^2 .

It is an emirp because it is prime and its reverse (3158891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1988513 - 2⁸ = 1988257 is a prime.

It is a plaindrome in base 11.

It is not a weakly prime, because it can be changed into another prime (1988533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 994256 + 994257.

It is an arithmetic number, because the mean of its divisors is an integer number (994257).

2^1988513 is an apocalyptic number.

It is an amenable number.

1988513 is a deficient number, since it is larger than the sum of its proper divisors (1).

1988513 is an equidigital number, since it uses as much as digits as its factorization.

1988513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 35.

The square root of 1988513 is about 1410.1464462956. The cubic root of 1988513 is about 125.7504298251.

The spelling of 1988513 in words is "one million, nine hundred eighty-eight thousand, five hundred thirteen".