1989765013 has 2 divisors, whose sum is σ = 1989765014. Its totient is φ = 1989765012.

The previous prime is 1989764993. The next prime is 1989765031. The reversal of 1989765013 is 3105679891.

Together with next prime (1989765031) 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., 1791574929 + 198190084 = 42327^2 + 14078^2 .

It is an emirp because it is prime and its reverse (3105679891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1989765013 - 2¹⁷ = 1989633941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1989765073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 994882506 + 994882507.

It is an arithmetic number, because the mean of its divisors is an integer number (994882507).

Almost surely, 2^1989765013 is an apocalyptic number.

It is an amenable number.

1989765013 is a deficient number, since it is larger than the sum of its proper divisors (1).

1989765013 is an equidigital number, since it uses as much as digits as its factorization.

1989765013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 408240, while the sum is 49.

The square root of 1989765013 is about 44606.7821412843. The cubic root of 1989765013 is about 1257.7681606477.

The spelling of 1989765013 in words is "one billion, nine hundred eighty-nine million, seven hundred sixty-five thousand, thirteen".