251012213 has 2 divisors, whose sum is σ = 251012214. Its totient is φ = 251012212.

The previous prime is 251012207. The next prime is 251012231. The reversal of 251012213 is 312210152.

It is a happy number.

Together with next prime (251012231) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 127757809 + 123254404 = 11303^2 + 11102^2 .

It is a cyclic number.

It is not a de Polignac number, because 251012213 - 2⁶ = 251012149 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 251012191 and 251012200.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (251012243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125506106 + 125506107.

It is an arithmetic number, because the mean of its divisors is an integer number (125506107).

Almost surely, 2^251012213 is an apocalyptic number.

It is an amenable number.

251012213 is a deficient number, since it is larger than the sum of its proper divisors (1).

251012213 is an equidigital number, since it uses as much as digits as its factorization.

251012213 is an evil number, because the sum of its binary digits is even.

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

The square root of 251012213 is about 15843.3649519286. The cubic root of 251012213 is about 630.8095857130.

Adding to 251012213 its reverse (312210152), we get a palindrome (563222365).

The spelling of 251012213 in words is "two hundred fifty-one million, twelve thousand, two hundred thirteen".