251012243 has 2 divisors, whose sum is σ = 251012244. Its totient is φ = 251012242.

The previous prime is 251012231. The next prime is 251012257. The reversal of 251012243 is 342210152.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-251012243 is a prime.

It is a super-2 number, since 2×251012243² = 126014292271782098, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (251012213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125506121 + 125506122.

It is an arithmetic number, because the mean of its divisors is an integer number (125506122).

Almost surely, 2^251012243 is an apocalyptic number.

251012243 is a deficient number, since it is larger than the sum of its proper divisors (1).

251012243 is an equidigital number, since it uses as much as digits as its factorization.

251012243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 251012243 is about 15843.3658986972. The cubic root of 251012243 is about 630.8096108437.

Adding to 251012243 its reverse (342210152), we get a palindrome (593222395).

The spelling of 251012243 in words is "two hundred fifty-one million, twelve thousand, two hundred forty-three".