73279981 has 2 divisors, whose sum is σ = 73279982. Its totient is φ = 73279980.

The previous prime is 73279967. The next prime is 73280021. The reversal of 73279981 is 18997237.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41538025 + 31741956 = 6445^2 + 5634^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-73279981 is a prime.

It is a super-2 number, since 2×73279981² = 10739911230720722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73279901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36639990 + 36639991.

It is an arithmetic number, because the mean of its divisors is an integer number (36639991).

Almost surely, 2^73279981 is an apocalyptic number.

It is an amenable number.

73279981 is a deficient number, since it is larger than the sum of its proper divisors (1).

73279981 is an equidigital number, since it uses as much as digits as its factorization.

73279981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 190512, while the sum is 46.

The square root of 73279981 is about 8560.3727138484. The cubic root of 73279981 is about 418.4675464805.

The spelling of 73279981 in words is "seventy-three million, two hundred seventy-nine thousand, nine hundred eighty-one".