251648 has 18 divisors (see below), whose sum is σ = 502824. Its totient is φ = 125696.

The previous prime is 251639. The next prime is 251653. The reversal of 251648 is 846152.

251648 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a plaindrome in base 14.

It is a congruent number.

It is an unprimeable number.

251648 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 as a sum of consecutive naturals, namely, 236 + ... + 747.

2²⁵¹⁶⁴⁸ is an apocalyptic number.

It is an amenable number.

251648 is a deficient number, since it is larger than the sum of its proper divisors (251176).

251648 is an frugal number, since it uses more digits than its factorization.

251648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 999 (or 985 counting only the distinct ones).

The product of its digits is 1920, while the sum is 26.

The square root of 251648 is about 501.6452930109. The cubic root of 251648 is about 63.1341727676.

The spelling of 251648 in words is "two hundred fifty-one thousand, six hundred forty-eight".