7278511081 has 2 divisors, whose sum is σ = 7278511082. Its totient is φ = 7278511080.

The previous prime is 7278511073. The next prime is 7278511117. The reversal of 7278511081 is 1801158727.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7237755625 + 40755456 = 85075^2 + 6384^2 .

It is a cyclic number.

It is not a de Polignac number, because 7278511081 - 2³ = 7278511073 is a prime.

It is a super-3 number, since 3×7278511081³ (a number of 31 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (7278511021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3639255540 + 3639255541.

It is an arithmetic number, because the mean of its divisors is an integer number (3639255541).

Almost surely, 2^7278511081 is an apocalyptic number.

It is an amenable number.

7278511081 is a deficient number, since it is larger than the sum of its proper divisors (1).

7278511081 is an equidigital number, since it uses as much as digits as its factorization.

7278511081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31360, while the sum is 40.

The square root of 7278511081 is about 85314.1903847185. The cubic root of 7278511081 is about 1937.9720794640.

The spelling of 7278511081 in words is "seven billion, two hundred seventy-eight million, five hundred eleven thousand, eighty-one".