251521132450543 has 2 divisors, whose sum is σ = 251521132450544. Its totient is φ = 251521132450542.

The previous prime is 251521132450513. The next prime is 251521132450583. The reversal of 251521132450543 is 345054231125152.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-251521132450543 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 251521132450543.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (251521132450513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125760566225271 + 125760566225272.

It is an arithmetic number, because the mean of its divisors is an integer number (125760566225272).

Almost surely, 2^{251521132450543} is an apocalyptic number.

251521132450543 is a deficient number, since it is larger than the sum of its proper divisors (1).

251521132450543 is an equidigital number, since it uses as much as digits as its factorization.

251521132450543 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720000, while the sum is 43.

Adding to 251521132450543 its reverse (345054231125152), we get a palindrome (596575363575695).

The spelling of 251521132450543 in words is "two hundred fifty-one trillion, five hundred twenty-one billion, one hundred thirty-two million, four hundred fifty thousand, five hundred forty-three".