651216112 has 80 divisors (see below), whose sum is σ = 1374912000. Its totient is φ = 297868032.

The previous prime is 651216109. The next prime is 651216119. The reversal of 651216112 is 211612156.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (651216119) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 1483189 + ... + 1483627.

It is an arithmetic number, because the mean of its divisors is an integer number (17186400).

Almost surely, 2^651216112 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 651216112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (687456000).

651216112 is an abundant number, since it is smaller than the sum of its proper divisors (723695888).

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

651216112 is a wasteful number, since it uses less digits than its factorization.

651216112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 638 (or 632 counting only the distinct ones).

The product of its digits is 720, while the sum is 25.

The square root of 651216112 is about 25518.9363414700. The cubic root of 651216112 is about 866.7789963541.

Adding to 651216112 its reverse (211612156), we get a palindrome (862828268).

The spelling of 651216112 in words is "six hundred fifty-one million, two hundred sixteen thousand, one hundred twelve".