910991989 has 8 divisors (see below), whose sum is σ = 915304320. Its totient is φ = 906690336.

The previous prime is 910991987. The next prime is 910992007. The reversal of 910991989 is 989199019.

910991989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 910991989 - 2¹ = 910991987 is a prime.

It is a super-2 number, since 2×910991989² = 1659812808044352242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (910991987) 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, 204417 + ... + 208825.

It is an arithmetic number, because the mean of its divisors is an integer number (114413040).

Almost surely, 2^910991989 is an apocalyptic number.

It is an amenable number.

910991989 is a deficient number, since it is larger than the sum of its proper divisors (4312331).

910991989 is a wasteful number, since it uses less digits than its factorization.

910991989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5339.

The product of its (nonzero) digits is 472392, while the sum is 55.

The square root of 910991989 is about 30182.6438371459. The cubic root of 910991989 is about 969.4041009967.

The spelling of 910991989 in words is "nine hundred ten million, nine hundred ninety-one thousand, nine hundred eighty-nine".