251116 has 12 divisors (see below), whose sum is σ = 446488. Its totient is φ = 123552.

The previous prime is 251099. The next prime is 251117. The reversal of 251116 is 611152.

It is a happy number.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 251116.

It is not an unprimeable number, because it can be changed into a prime (251117) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 201 + ... + 736.

2²⁵¹¹¹⁶ is an apocalyptic number.

It is an amenable number.

251116 is a deficient number, since it is larger than the sum of its proper divisors (195372).

251116 is a wasteful number, since it uses less digits than its factorization.

251116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1008 (or 1006 counting only the distinct ones).

The product of its digits is 60, while the sum is 16.

The square root of 251116 is about 501.1147573161. The cubic root of 251116 is about 63.0896514834.

Adding to 251116 its reverse (611152), we get a palindrome (862268).

The spelling of 251116 in words is "two hundred fifty-one thousand, one hundred sixteen".