251403223 has 2 divisors, whose sum is σ = 251403224. Its totient is φ = 251403222.

The previous prime is 251403209. The next prime is 251403239. The reversal of 251403223 is 322304152.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 251403223 - 2²⁵ = 217848791 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 251403194 and 251403203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (251403203) 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 as a sum of consecutive naturals, namely, 125701611 + 125701612.

It is an arithmetic number, because the mean of its divisors is an integer number (125701612).

Almost surely, 2^251403223 is an apocalyptic number.

251403223 is a deficient number, since it is larger than the sum of its proper divisors (1).

251403223 is an equidigital number, since it uses as much as digits as its factorization.

251403223 is an odious number, because the sum of its binary digits is odd.

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

The square root of 251403223 is about 15855.7000160825. The cubic root of 251403223 is about 631.1369600810.

Adding to 251403223 its reverse (322304152), we get a palindrome (573707375).

The spelling of 251403223 in words is "two hundred fifty-one million, four hundred three thousand, two hundred twenty-three".