251042643133 has 2 divisors, whose sum is σ = 251042643134. Its totient is φ = 251042643132.

The previous prime is 251042643113. The next prime is 251042643169. The reversal of 251042643133 is 331346240152.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 250997994009 + 44649124 = 500997^2 + 6682^2 .

It is a cyclic number.

It is not a de Polignac number, because 251042643133 - 2²⁹ = 250505772221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (251042643113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125521321566 + 125521321567.

It is an arithmetic number, because the mean of its divisors is an integer number (125521321567).

Almost surely, 2^251042643133 is an apocalyptic number.

It is an amenable number.

251042643133 is a deficient number, since it is larger than the sum of its proper divisors (1).

251042643133 is an equidigital number, since it uses as much as digits as its factorization.

251042643133 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51840, while the sum is 34.

Adding to 251042643133 its reverse (331346240152), we get a palindrome (582388883285).

The spelling of 251042643133 in words is "two hundred fifty-one billion, forty-two million, six hundred forty-three thousand, one hundred thirty-three".