981911228 has 12 divisors (see below), whose sum is σ = 1819423872. Its totient is φ = 462075840.

The previous prime is 981911209. The next prime is 981911243. The reversal of 981911228 is 822119189.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7219868 + ... + 7220003.

It is an arithmetic number, because the mean of its divisors is an integer number (151618656).

Almost surely, 2^981911228 is an apocalyptic number.

It is an amenable number.

981911228 is a deficient number, since it is larger than the sum of its proper divisors (837512644).

981911228 is a wasteful number, since it uses less digits than its factorization.

981911228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14439892 (or 14439890 counting only the distinct ones).

The product of its digits is 20736, while the sum is 41.

The square root of 981911228 is about 31335.4627857959. The cubic root of 981911228 is about 993.9336835520.

The spelling of 981911228 in words is "nine hundred eighty-one million, nine hundred eleven thousand, two hundred twenty-eight".