651216 has 20 divisors (see below), whose sum is σ = 1682432. Its totient is φ = 217056.

The previous prime is 651193. The next prime is 651221. The reversal of 651216 is 612156.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 651192 and 651201.

It is a congruent number.

It is an unprimeable number.

651216 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6736 + ... + 6831.

2⁶⁵¹²¹⁶ is an apocalyptic number.

It is an amenable number.

651216 is an abundant number, since it is smaller than the sum of its proper divisors (1031216).

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

651216 is a wasteful number, since it uses less digits than its factorization.

651216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13578 (or 13572 counting only the distinct ones).

The product of its digits is 360, while the sum is 21.

The square root of 651216 is about 806.9795536443. The cubic root of 651216 is about 86.6778946663.

Subtracting from 651216 its reverse (612156), we obtain a triangular number (39060 = T₂₇₉).

The spelling of 651216 in words is "six hundred fifty-one thousand, two hundred sixteen".