251223223 has 4 divisors (see below), whose sum is σ = 251257960. Its totient is φ = 251188488.

The previous prime is 251223209. The next prime is 251223251. The reversal of 251223223 is 322322152.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 251223223 - 2¹⁷ = 251092151 is a prime.

It is a super-2 number, since 2×251223223² = 126226215549015458, 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 = 251223194 and 251223203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251223253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1968 + ... + 22501.

It is an arithmetic number, because the mean of its divisors is an integer number (62814490).

Almost surely, 2^251223223 is an apocalyptic number.

251223223 is a deficient number, since it is larger than the sum of its proper divisors (34737).

251223223 is a wasteful number, since it uses less digits than its factorization.

251223223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34736.

The product of its digits is 1440, while the sum is 22.

The square root of 251223223 is about 15850.0228075546. The cubic root of 251223223 is about 630.9862967029.

Adding to 251223223 its reverse (322322152), we get a palindrome (573545375).

The spelling of 251223223 in words is "two hundred fifty-one million, two hundred twenty-three thousand, two hundred twenty-three".