249251 has 4 divisors (see below), whose sum is σ = 260112. Its totient is φ = 238392.

The previous prime is 249233. The next prime is 249253. The reversal of 249251 is 152942.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 152942 = 2 ⋅76471.

It is a cyclic number.

It is not a de Polignac number, because 249251 - 2⁶ = 249187 is a prime.

It is a super-2 number, since 2×249251² = 124252122002, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 10837 = 249251 / (2 + 4 + 9 + 2 + 5 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (249253) 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, 5396 + ... + 5441.

It is an arithmetic number, because the mean of its divisors is an integer number (65028).

2²⁴⁹²⁵¹ is an apocalyptic number.

249251 is a deficient number, since it is larger than the sum of its proper divisors (10861).

249251 is a wasteful number, since it uses less digits than its factorization.

249251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10860.

The product of its digits is 720, while the sum is 23.

The square root of 249251 is about 499.2504381570. The cubic root of 249251 is about 62.9330775040.

The spelling of 249251 in words is "two hundred forty-nine thousand, two hundred fifty-one".