251213 has 4 divisors (see below), whose sum is σ = 252540. Its totient is φ = 249888.

The previous prime is 251203. The next prime is 251219. The reversal of 251213 is 312152.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 162409 + 88804 = 403^2 + 298^2 .

It is a cyclic number.

It is not a de Polignac number, because 251213 - 2⁴ = 251197 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251219) 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, 320 + ... + 777.

It is an arithmetic number, because the mean of its divisors is an integer number (63135).

2²⁵¹²¹³ is an apocalyptic number.

It is an amenable number.

251213 is a deficient number, since it is larger than the sum of its proper divisors (1327).

251213 is a wasteful number, since it uses less digits than its factorization.

251213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1326.

The product of its digits is 60, while the sum is 14.

The square root of 251213 is about 501.2115321898. The cubic root of 251213 is about 63.0977737701.

Adding to 251213 its reverse (312152), we get a palindrome (563365).

It can be divided in two parts, 251 and 213, that added together give a palindrome (464).

The spelling of 251213 in words is "two hundred fifty-one thousand, two hundred thirteen".