9278064581 has 2 divisors, whose sum is σ = 9278064582. Its totient is φ = 9278064580.

The previous prime is 9278064571. The next prime is 9278064707. The reversal of 9278064581 is 1854608729.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9065896225 + 212168356 = 95215^2 + 14566^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9278064581 is a prime.

It is a super-2 number, since 2×9278064581² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9278064571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4639032290 + 4639032291.

It is an arithmetic number, because the mean of its divisors is an integer number (4639032291).

Almost surely, 2^9278064581 is an apocalyptic number.

It is an amenable number.

9278064581 is a deficient number, since it is larger than the sum of its proper divisors (1).

9278064581 is an equidigital number, since it uses as much as digits as its factorization.

9278064581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 967680, while the sum is 50.

The square root of 9278064581 is about 96322.7106190435. The cubic root of 9278064581 is about 2101.2890484119.

The spelling of 9278064581 in words is "nine billion, two hundred seventy-eight million, sixty-four thousand, five hundred eighty-one".