7195222781 has 2 divisors, whose sum is σ = 7195222782. Its totient is φ = 7195222780.

The previous prime is 7195222753. The next prime is 7195222787. The reversal of 7195222781 is 1872225917.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6007800100 + 1187422681 = 77510^2 + 34459^2 .

It is an emirp because it is prime and its reverse (1872225917) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7195222781 - 2¹⁰ = 7195221757 is a prime.

It is a super-2 number, since 2×7195222781² (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 (7195222787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3597611390 + 3597611391.

It is an arithmetic number, because the mean of its divisors is an integer number (3597611391).

Almost surely, 2^7195222781 is an apocalyptic number.

It is an amenable number.

7195222781 is a deficient number, since it is larger than the sum of its proper divisors (1).

7195222781 is an equidigital number, since it uses as much as digits as its factorization.

7195222781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 141120, while the sum is 44.

The square root of 7195222781 is about 84824.6590385131. The cubic root of 7195222781 is about 1930.5516048861.

The spelling of 7195222781 in words is "seven billion, one hundred ninety-five million, two hundred twenty-two thousand, seven hundred eighty-one".