7172723081 has 2 divisors, whose sum is σ = 7172723082. Its totient is φ = 7172723080.

The previous prime is 7172723057. The next prime is 7172723093. The reversal of 7172723081 is 1803272717.

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., 7022440000 + 150283081 = 83800^2 + 12259^2 .

It is an emirp because it is prime and its reverse (1803272717) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7172723081 - 2¹⁰ = 7172722057 is a prime.

It is a super-2 number, since 2×7172723081² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (7172723021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3586361540 + 3586361541.

It is an arithmetic number, because the mean of its divisors is an integer number (3586361541).

Almost surely, 2^7172723081 is an apocalyptic number.

It is an amenable number.

7172723081 is a deficient number, since it is larger than the sum of its proper divisors (1).

7172723081 is an equidigital number, since it uses as much as digits as its factorization.

7172723081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32928, while the sum is 38.

The square root of 7172723081 is about 84691.9304361401. The cubic root of 7172723081 is about 1928.5372041175.

Adding to 7172723081 its reverse (1803272717), we get a palindrome (8975995798).

The spelling of 7172723081 in words is "seven billion, one hundred seventy-two million, seven hundred twenty-three thousand, eighty-one".