651015220 has 48 divisors (see below), whose sum is σ = 1403868816. Its totient is φ = 253440000.

The previous prime is 651015217. The next prime is 651015223. The reversal of 651015220 is 22510156.

651015220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (651015217) and next prime (651015223).

It can be written as a sum of positive squares in 8 ways, for example, as 5143824 + 645871396 = 2268^2 + 25414^2 .

It is a junction number, because it is equal to n+sod(n) for n = 651015191 and 651015200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (651015223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 492160 + ... + 493480.

It is an arithmetic number, because the mean of its divisors is an integer number (29247267).

Almost surely, 2^651015220 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 651015220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (701934408).

651015220 is an abundant number, since it is smaller than the sum of its proper divisors (752853596).

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

651015220 is a wasteful number, since it uses less digits than its factorization.

651015220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1972 (or 1970 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 651015220 is about 25514.9999020184. Note that the first 4 decimals coincide. The cubic root of 651015220 is about 866.6898570389.

Adding to 651015220 its reverse (22510156), we get a palindrome (673525376).

The spelling of 651015220 in words is "six hundred fifty-one million, fifteen thousand, two hundred twenty".