49638251521 has 2 divisors, whose sum is σ = 49638251522. Its totient is φ = 49638251520.

The previous prime is 49638251473. The next prime is 49638251561. The reversal of 49638251521 is 12515283694.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47801700496 + 1836551025 = 218636^2 + 42855^2 .

It is a cyclic number.

It is not a de Polignac number, because 49638251521 - 2¹¹ = 49638249473 is a prime.

It is not a weakly prime, because it can be changed into another prime (49638251561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24819125760 + 24819125761.

It is an arithmetic number, because the mean of its divisors is an integer number (24819125761).

Almost surely, 2^49638251521 is an apocalyptic number.

It is an amenable number.

49638251521 is a deficient number, since it is larger than the sum of its proper divisors (1).

49638251521 is an equidigital number, since it uses as much as digits as its factorization.

49638251521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 518400, while the sum is 46.

The spelling of 49638251521 in words is "forty-nine billion, six hundred thirty-eight million, two hundred fifty-one thousand, five hundred twenty-one".