1019911989 has 8 divisors (see below), whose sum is σ = 1380179680. Its totient is φ = 669792816.

The previous prime is 1019911961. The next prime is 1019911999. The reversal of 1019911989 is 9891199101.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1019911989 - 2⁷ = 1019911861 is a prime.

It is a super-2 number, since 2×1019911989² = 2080440930611872242, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1019911939) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2536894 + ... + 2537295.

It is an arithmetic number, because the mean of its divisors is an integer number (172522460).

Almost surely, 2^1019911989 is an apocalyptic number.

It is an amenable number.

1019911989 is a deficient number, since it is larger than the sum of its proper divisors (360267691).

1019911989 is an equidigital number, since it uses as much as digits as its factorization.

1019911989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5074259.

The product of its (nonzero) digits is 52488, while the sum is 48.

The square root of 1019911989 is about 31936.0609499669. The cubic root of 1019911989 is about 1006.5937564818.

The spelling of 1019911989 in words is "one billion, nineteen million, nine hundred eleven thousand, nine hundred eighty-nine".