251142233 has 4 divisors (see below), whose sum is σ = 259802340. Its totient is φ = 242482128.

The previous prime is 251142223. The next prime is 251142251. The reversal of 251142233 is 332241152.

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 56595529 + 194546704 = 7523^2 + 13948^2 .

It is a cyclic number.

It is not a de Polignac number, because 251142233 - 2⁴ = 251142217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 251142199 and 251142208.

It is not an unprimeable number, because it can be changed into a prime (251142223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4330010 + ... + 4330067.

It is an arithmetic number, because the mean of its divisors is an integer number (64950585).

Almost surely, 2^251142233 is an apocalyptic number.

It is an amenable number.

251142233 is a deficient number, since it is larger than the sum of its proper divisors (8660107).

251142233 is an equidigital number, since it uses as much as digits as its factorization.

251142233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8660106.

The product of its digits is 1440, while the sum is 23.

The square root of 251142233 is about 15847.4677156951. The cubic root of 251142233 is about 630.9184830772.

Adding to 251142233 its reverse (332241152), we get a palindrome (583383385).

It can be divided in two parts, 2511 and 42233, that added together give a palindrome (44744).

The spelling of 251142233 in words is "two hundred fifty-one million, one hundred forty-two thousand, two hundred thirty-three".