251487216 has 30 divisors (see below), whose sum is σ = 703815320. Its totient is φ = 83829024.

The previous prime is 251487199. The next prime is 251487227. The reversal of 251487216 is 612784152.

It is a super-2 number, since 2×251487216² = 126491639622861312, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 873076 + ... + 873363.

Almost surely, 2^251487216 is an apocalyptic number.

It is an amenable number.

251487216 is an abundant number, since it is smaller than the sum of its proper divisors (452328104).

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

251487216 is a wasteful number, since it uses less digits than its factorization.

251487216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1746453 (or 1746444 counting only the distinct ones).

The product of its digits is 26880, while the sum is 36.

The square root of 251487216 is about 15858.3484638218. The cubic root of 251487216 is about 631.2072391908.

The spelling of 251487216 in words is "two hundred fifty-one million, four hundred eighty-seven thousand, two hundred sixteen".