251012231 has 2 divisors, whose sum is σ = 251012232. Its totient is φ = 251012230.

The previous prime is 251012213. The next prime is 251012243. The reversal of 251012231 is 132210152.

It is a happy number.

Together with previous prime (251012213) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 251012231 - 2¹⁰ = 251011207 is a prime.

It is a super-2 number, since 2×251012231² = 126014280223194722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (251012831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125506115 + 125506116.

It is an arithmetic number, because the mean of its divisors is an integer number (125506116).

Almost surely, 2^251012231 is an apocalyptic number.

251012231 is a deficient number, since it is larger than the sum of its proper divisors (1).

251012231 is an equidigital number, since it uses as much as digits as its factorization.

251012231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 251012231 is about 15843.3655199897. The cubic root of 251012231 is about 630.8096007914.

Adding to 251012231 its reverse (132210152), we get a palindrome (383222383).

It can be divided in two parts, 2510 and 12231, that added together give a palindrome (14741).

The spelling of 251012231 in words is "two hundred fifty-one million, twelve thousand, two hundred thirty-one".