251009999473 has 2 divisors, whose sum is σ = 251009999474. Its totient is φ = 251009999472.

The previous prime is 251009999459. The next prime is 251009999567. The reversal of 251009999473 is 374999900152.

251009999473 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 234107919409 + 16902080064 = 483847^2 + 130008^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-251009999473 is a prime.

It is not a weakly prime, because it can be changed into another prime (251009999423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125504999736 + 125504999737.

It is an arithmetic number, because the mean of its divisors is an integer number (125504999737).

Almost surely, 2^251009999473 is an apocalyptic number.

It is an amenable number.

251009999473 is a deficient number, since it is larger than the sum of its proper divisors (1).

251009999473 is an equidigital number, since it uses as much as digits as its factorization.

251009999473 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5511240, while the sum is 58.

The spelling of 251009999473 in words is "two hundred fifty-one billion, nine million, nine hundred ninety-nine thousand, four hundred seventy-three".