7273999981 has 2 divisors, whose sum is σ = 7273999982. Its totient is φ = 7273999980.

The previous prime is 7273999963. The next prime is 7274000003. The reversal of 7273999981 is 1899993727.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4584644100 + 2689355881 = 67710^2 + 51859^2 .

It is an emirp because it is prime and its reverse (1899993727) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7273999981 - 2⁵ = 7273999949 is a prime.

It is a super-2 number, since 2×7273999981² (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 (7273999781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3636999990 + 3636999991.

It is an arithmetic number, because the mean of its divisors is an integer number (3636999991).

Almost surely, 2^7273999981 is an apocalyptic number.

It is an amenable number.

7273999981 is a deficient number, since it is larger than the sum of its proper divisors (1).

7273999981 is an equidigital number, since it uses as much as digits as its factorization.

7273999981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15431472, while the sum is 64.

The square root of 7273999981 is about 85287.7481294940. The cubic root of 7273999981 is about 1937.5716224429.

The spelling of 7273999981 in words is "seven billion, two hundred seventy-three million, nine hundred ninety-nine thousand, nine hundred eighty-one".