2728551380981 has 2 divisors, whose sum is σ = 2728551380982. Its totient is φ = 2728551380980.

The previous prime is 2728551380917. The next prime is 2728551381013. The reversal of 2728551380981 is 1890831558272.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2101499619025 + 627051761956 = 1449655^2 + 791866^2 .

It is a cyclic number.

It is not a de Polignac number, because 2728551380981 - 2⁶ = 2728551380917 is a prime.

It is a super-2 number, since 2×2728551380981² (a number of 26 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2728551380981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2728551383981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1364275690490 + 1364275690491.

It is an arithmetic number, because the mean of its divisors is an integer number (1364275690491).

Almost surely, 2^{2728551380981} is an apocalyptic number.

It is an amenable number.

2728551380981 is a deficient number, since it is larger than the sum of its proper divisors (1).

2728551380981 is an equidigital number, since it uses as much as digits as its factorization.

2728551380981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9676800, while the sum is 59.

The spelling of 2728551380981 in words is "two trillion, seven hundred twenty-eight billion, five hundred fifty-one million, three hundred eighty thousand, nine hundred eighty-one".