251123 has 4 divisors (see below), whose sum is σ = 264360. Its totient is φ = 237888.

The previous prime is 251117. The next prime is 251143. The reversal of 251123 is 321152.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 251123 - 2⁶ = 251059 is a prime.

It is a super-2 number, since 2×251123² = 126125522258, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 251098 and 251107.

It is not an unprimeable number, because it can be changed into a prime (251143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6590 + ... + 6627.

It is an arithmetic number, because the mean of its divisors is an integer number (66090).

2²⁵¹¹²³ is an apocalyptic number.

251123 is a deficient number, since it is larger than the sum of its proper divisors (13237).

251123 is a wasteful number, since it uses less digits than its factorization.

251123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13236.

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

The square root of 251123 is about 501.1217416956. The cubic root of 251123 is about 63.0902376978.

Adding to 251123 its reverse (321152), we get a palindrome (572275).

The spelling of 251123 in words is "two hundred fifty-one thousand, one hundred twenty-three".