1989306911 has 4 divisors (see below), whose sum is σ = 1992074400. Its totient is φ = 1986539424.

The previous prime is 1989306863. The next prime is 1989306923. The reversal of 1989306911 is 1196039891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1196039891 = 701 ⋅1706191.

It is a cyclic number.

It is not a de Polignac number, because 1989306911 - 2¹⁰ = 1989305887 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 (1989306941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1382666 + ... + 1384103.

It is an arithmetic number, because the mean of its divisors is an integer number (498018600).

Almost surely, 2^1989306911 is an apocalyptic number.

1989306911 is a deficient number, since it is larger than the sum of its proper divisors (2767489).

1989306911 is an equidigital number, since it uses as much as digits as its factorization.

1989306911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2767488.

The product of its (nonzero) digits is 104976, while the sum is 47.

The square root of 1989306911 is about 44601.6469538962. The cubic root of 1989306911 is about 1257.6716282548.

The spelling of 1989306911 in words is "one billion, nine hundred eighty-nine million, three hundred six thousand, nine hundred eleven".