251713216 has 56 divisors (see below), whose sum is σ = 528248880. Its totient is φ = 118674432.

The previous prime is 251713199. The next prime is 251713223. The reversal of 251713216 is 612317152.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 385146 + ... + 385798.

Almost surely, 2^251713216 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 251713216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (264124440).

251713216 is an abundant number, since it is smaller than the sum of its proper divisors (276535664).

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

251713216 is a wasteful number, since it uses less digits than its factorization.

251713216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1001 (or 991 counting only the distinct ones).

The product of its digits is 2520, while the sum is 28.

The square root of 251713216 is about 15865.4724480552. The cubic root of 251713216 is about 631.3962615565.

The spelling of 251713216 in words is "two hundred fifty-one million, seven hundred thirteen thousand, two hundred sixteen".