49439981261521 has 2 divisors, whose sum is σ = 49439981261522. Its totient is φ = 49439981261520.

The previous prime is 49439981261443. The next prime is 49439981261543. The reversal of 49439981261521 is 12516218993494.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47661225571521 + 1778755690000 = 6903711^2 + 1333700^2 .

It is a cyclic number.

It is not a de Polignac number, because 49439981261521 - 2¹⁵ = 49439981228753 is a prime.

It is a super-2 number, since 2×49439981261521² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (49439981261581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24719990630760 + 24719990630761.

It is an arithmetic number, because the mean of its divisors is an integer number (24719990630761).

Almost surely, 2^{49439981261521} is an apocalyptic number.

It is an amenable number.

49439981261521 is a deficient number, since it is larger than the sum of its proper divisors (1).

49439981261521 is an equidigital number, since it uses as much as digits as its factorization.

49439981261521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 33592320, while the sum is 64.

The spelling of 49439981261521 in words is "forty-nine trillion, four hundred thirty-nine billion, nine hundred eighty-one million, two hundred sixty-one thousand, five hundred twenty-one".