251245 has 8 divisors (see below), whose sum is σ = 304920. Its totient is φ = 198720.

The previous prime is 251233. The next prime is 251257. The reversal of 251245 is 542152.

It is an interprime number because it is at equal distance from previous prime (251233) and next prime (251257).

It can be written as a sum of positive squares in 4 ways, for example, as 26569 + 224676 = 163^2 + 474^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 251245 - 2⁷ = 251117 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 315 + ... + 775.

It is an arithmetic number, because the mean of its divisors is an integer number (38115).

2²⁵¹²⁴⁵ is an apocalyptic number.

It is an amenable number.

251245 is a deficient number, since it is larger than the sum of its proper divisors (53675).

251245 is a wasteful number, since it uses less digits than its factorization.

251245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 575.

The product of its digits is 400, while the sum is 19.

The square root of 251245 is about 501.2434538226. The cubic root of 251245 is about 63.1004528286.

Adding to 251245 its reverse (542152), we get a palindrome (793397).

It can be divided in two parts, 251 and 245, that added together give a triangular number (496 = T₃₁).

The spelling of 251245 in words is "two hundred fifty-one thousand, two hundred forty-five".