928971891 has 24 divisors (see below), whose sum is σ = 1377295920. Its totient is φ = 603014400.

The previous prime is 928971887. The next prime is 928971893. The reversal of 928971891 is 198179829.

It is not a de Polignac number, because 928971891 - 2² = 928971887 is a prime.

It is not an unprimeable number, because it can be changed into a prime (928971893) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 208495 + ... + 212903.

It is an arithmetic number, because the mean of its divisors is an integer number (57387330).

Almost surely, 2^928971891 is an apocalyptic number.

928971891 is a deficient number, since it is larger than the sum of its proper divisors (448324029).

928971891 is a wasteful number, since it uses less digits than its factorization.

928971891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5027 (or 5024 counting only the distinct ones).

The product of its digits is 653184, while the sum is 54.

The square root of 928971891 is about 30479.0401915808. The cubic root of 928971891 is about 975.7401842881.

The spelling of 928971891 in words is "nine hundred twenty-eight million, nine hundred seventy-one thousand, eight hundred ninety-one".