911721216 has 72 divisors (see below), whose sum is σ = 2773168384. Its totient is φ = 260490240.

The previous prime is 911721197. The next prime is 911721221. The reversal of 911721216 is 612127119.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79420 + ... + 90171.

Almost surely, 2^911721216 is an apocalyptic number.

911721216 is a gapful number since it is divisible by the number (96) formed by its first and last digit.

It is an amenable number.

911721216 is an abundant number, since it is smaller than the sum of its proper divisors (1861447168).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

911721216 is a wasteful number, since it uses less digits than its factorization.

911721216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169617 (or 169603 counting only the distinct ones).

The product of its digits is 1512, while the sum is 30.

The square root of 911721216 is about 30194.7216579322. The cubic root of 911721216 is about 969.6626935031.

The spelling of 911721216 in words is "nine hundred eleven million, seven hundred twenty-one thousand, two hundred sixteen".