251330 has 16 divisors (see below), whose sum is σ = 464184. Its totient is φ = 97920.

The previous prime is 251323. The next prime is 251347. The reversal of 251330 is 33152.

It can be written as a sum of positive squares in 4 ways, for example, as 49729 + 201601 = 223^2 + 449^2 .

It is an unprimeable number.

251330 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 7 ways as a sum of consecutive naturals, for example, 104 + ... + 716.

2²⁵¹³³⁰ is an apocalyptic number.

251330 is a deficient number, since it is larger than the sum of its proper divisors (212854).

251330 is a wasteful number, since it uses less digits than its factorization.

251330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 661.

The product of its (nonzero) digits is 90, while the sum is 14.

The square root of 251330 is about 501.3282357897. The cubic root of 251330 is about 63.1075679736.

Adding to 251330 its reverse (33152), we get a palindrome (284482).

The spelling of 251330 in words is "two hundred fifty-one thousand, three hundred thirty".