5278049981 has 2 divisors, whose sum is σ = 5278049982. Its totient is φ = 5278049980.

The previous prime is 5278049947. The next prime is 5278050017. The reversal of 5278049981 is 1899408725.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5203313956 + 74736025 = 72134^2 + 8645^2 .

It is a cyclic number.

It is not a de Polignac number, because 5278049981 - 2¹⁰ = 5278048957 is a prime.

It is a super-2 number, since 2×5278049981² = 55715623203868200722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5278049911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2639024990 + 2639024991.

It is an arithmetic number, because the mean of its divisors is an integer number (2639024991).

Almost surely, 2^5278049981 is an apocalyptic number.

It is an amenable number.

5278049981 is a deficient number, since it is larger than the sum of its proper divisors (1).

5278049981 is an equidigital number, since it uses as much as digits as its factorization.

5278049981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1451520, while the sum is 53.

The square root of 5278049981 is about 72650.1891325824. The cubic root of 5278049981 is about 1741.1031430078.

It can be divided in two parts, 527 and 8049981, that added together give a palindrome (8050508).

The spelling of 5278049981 in words is "five billion, two hundred seventy-eight million, forty-nine thousand, nine hundred eighty-one".