251231012403533 has 2 divisors, whose sum is σ = 251231012403534. Its totient is φ = 251231012403532.

The previous prime is 251231012403467. The next prime is 251231012403541. The reversal of 251231012403533 is 335304210132152.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 206602159290244 + 44628853113289 = 14373662^2 + 6680483^2 .

It is a cyclic number.

It is not a de Polignac number, because 251231012403533 - 2¹⁰ = 251231012402509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 251231012403493 and 251231012403502.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (251231012403433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125615506201766 + 125615506201767.

It is an arithmetic number, because the mean of its divisors is an integer number (125615506201767).

Almost surely, 2^{251231012403533} is an apocalyptic number.

It is an amenable number.

251231012403533 is a deficient number, since it is larger than the sum of its proper divisors (1).

251231012403533 is an equidigital number, since it uses as much as digits as its factorization.

251231012403533 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64800, while the sum is 35.

Adding to 251231012403533 its reverse (335304210132152), we get a palindrome (586535222535685).

The spelling of 251231012403533 in words is "two hundred fifty-one trillion, two hundred thirty-one billion, twelve million, four hundred three thousand, five hundred thirty-three".