7147178561 has 2 divisors, whose sum is σ = 7147178562. Its totient is φ = 7147178560.

The previous prime is 7147178503. The next prime is 7147178579. The reversal of 7147178561 is 1658717417.

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., 4777436161 + 2369742400 = 69119^2 + 48680^2 .

It is a cyclic number.

It is not a de Polignac number, because 7147178561 - 2¹⁰ = 7147177537 is a prime.

It is a super-2 number, since 2×7147178561² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (7147178761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3573589280 + 3573589281.

It is an arithmetic number, because the mean of its divisors is an integer number (3573589281).

Almost surely, 2^7147178561 is an apocalyptic number.

It is an amenable number.

7147178561 is a deficient number, since it is larger than the sum of its proper divisors (1).

7147178561 is an equidigital number, since it uses as much as digits as its factorization.

7147178561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 329280, while the sum is 47.

The square root of 7147178561 is about 84540.9874617040. The cubic root of 7147178561 is about 1926.2450874385.

The spelling of 7147178561 in words is "seven billion, one hundred forty-seven million, one hundred seventy-eight thousand, five hundred sixty-one".