651222 has 72 divisors (see below), whose sum is σ = 1742832. Its totient is φ = 174240.

The previous prime is 651221. The next prime is 651223. The reversal of 651222 is 222156.

It is an interprime number because it is at equal distance from previous prime (651221) and next prime (651223).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 651195 and 651204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (651221) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 28303 + ... + 28325.

It is an arithmetic number, because the mean of its divisors is an integer number (24206).

2⁶⁵¹²²² is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 651222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (871416).

651222 is an abundant number, since it is smaller than the sum of its proper divisors (1091610).

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

651222 is a wasteful number, since it uses less digits than its factorization.

651222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66 (or 52 counting only the distinct ones).

The product of its digits is 240, while the sum is 18.

The square root of 651222 is about 806.9832712021. The cubic root of 651222 is about 86.6781608687.

Adding to 651222 its reverse (222156), we get a palindrome (873378).

The spelling of 651222 in words is "six hundred fifty-one thousand, two hundred twenty-two".