651520 has 36 divisors (see below), whose sum is σ = 1563660. Its totient is φ = 260096.

The previous prime is 651517. The next prime is 651587. The reversal of 651520 is 25156.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 389376 + 262144 = 624^2 + 512^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1026 + ... + 1534.

It is an arithmetic number, because the mean of its divisors is an integer number (43435).

2⁶⁵¹⁵²⁰ 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 651520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (781830).

651520 is an abundant number, since it is smaller than the sum of its proper divisors (912140).

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

651520 is an equidigital number, since it uses as much as digits as its factorization.

651520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 530 (or 516 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 651520 is about 807.1678883603. The cubic root of 651520 is about 86.6913801973.

Adding to 651520 its reverse (25156), we get a palindrome (676676).

The spelling of 651520 in words is "six hundred fifty-one thousand, five hundred twenty".