1989996511 has 2 divisors, whose sum is σ = 1989996512. Its totient is φ = 1989996510.

The previous prime is 1989996499. The next prime is 1989996517. The reversal of 1989996511 is 1156999891.

It is a strong prime.

It is an emirp because it is prime and its reverse (1156999891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1989996511 - 2⁷ = 1989996383 is a prime.

It is a super-2 number, since 2×1989996511² = 7920172227584346242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1989996517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 994998255 + 994998256.

It is an arithmetic number, because the mean of its divisors is an integer number (994998256).

Almost surely, 2^1989996511 is an apocalyptic number.

1989996511 is a deficient number, since it is larger than the sum of its proper divisors (1).

1989996511 is an equidigital number, since it uses as much as digits as its factorization.

1989996511 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1574640, while the sum is 58.

The square root of 1989996511 is about 44609.3769402802. The cubic root of 1989996511 is about 1257.8169368467.

The spelling of 1989996511 in words is "one billion, nine hundred eighty-nine million, nine hundred ninety-six thousand, five hundred eleven".