251242 has 4 divisors (see below), whose sum is σ = 376866. Its totient is φ = 125620.

The previous prime is 251233. The next prime is 251257. The reversal of 251242 is 242152.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 231361 + 19881 = 481^2 + 141^2 .

It is a plaindrome in base 14.

It is a zygodrome in base 4.

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 as a sum of consecutive naturals, namely, 62809 + ... + 62812.

2²⁵¹²⁴² is an apocalyptic number.

251242 is a deficient number, since it is larger than the sum of its proper divisors (125624).

251242 is a wasteful number, since it uses less digits than its factorization.

251242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125623.

The product of its digits is 160, while the sum is 16.

The square root of 251242 is about 501.2404612559. The cubic root of 251242 is about 63.1002016766.

Adding to 251242 its reverse (242152), we get a palindrome (493394).

The spelling of 251242 in words is "two hundred fifty-one thousand, two hundred forty-two".