1989996311 has 4 divisors (see below), whose sum is σ = 1990098000. Its totient is φ = 1989894624.

The previous prime is 1989996289. The next prime is 1989996343. The reversal of 1989996311 is 1136999891.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1989996311 - 2³⁰ = 916254487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1989996511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11171 + ... + 64068.

It is an arithmetic number, because the mean of its divisors is an integer number (497524500).

Almost surely, 2^1989996311 is an apocalyptic number.

1989996311 is a deficient number, since it is larger than the sum of its proper divisors (101689).

1989996311 is an equidigital number, since it uses as much as digits as its factorization.

1989996311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101688.

The product of its digits is 944784, while the sum is 56.

The square root of 1989996311 is about 44609.3746985989. The cubic root of 1989996311 is about 1257.8168947087.

The spelling of 1989996311 in words is "one billion, nine hundred eighty-nine million, nine hundred ninety-six thousand, three hundred eleven".