501381216 has 72 divisors (see below), whose sum is σ = 1629495504. Its totient is φ = 143251200.

The previous prime is 501381211. The next prime is 501381277. The reversal of 501381216 is 612183105.

501381216 is a `hidden beast` number, since 501 + 38 + 121 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a self number, because there is not a number n which added to its sum of digits gives 501381216.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (501381211) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 122335 + ... + 126366.

It is an arithmetic number, because the mean of its divisors is an integer number (22631882).

Almost surely, 2^501381216 is an apocalyptic number.

501381216 is a gapful number since it is divisible by the number (56) formed by its first and last digit.

It is an amenable number.

501381216 is an abundant number, since it is smaller than the sum of its proper divisors (1128114288).

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

501381216 is a wasteful number, since it uses less digits than its factorization.

501381216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248724 (or 248713 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 501381216 is about 22391.5434037049. The cubic root of 501381216 is about 794.4307019529.

The spelling of 501381216 in words is "five hundred one million, three hundred eighty-one thousand, two hundred sixteen".