72943081 has 2 divisors, whose sum is σ = 72943082. Its totient is φ = 72943080.

The previous prime is 72943067. The next prime is 72943111. The reversal of 72943081 is 18034927.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52693081 + 20250000 = 7259^2 + 4500^2 .

It is an emirp because it is prime and its reverse (18034927) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72943081 - 2⁷ = 72942953 is a prime.

It is a super-2 number, since 2×72943081² = 10641386131545122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (72943061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36471540 + 36471541.

It is an arithmetic number, because the mean of its divisors is an integer number (36471541).

Almost surely, 2^72943081 is an apocalyptic number.

It is an amenable number.

72943081 is a deficient number, since it is larger than the sum of its proper divisors (1).

72943081 is an equidigital number, since it uses as much as digits as its factorization.

72943081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 72943081 is about 8540.6721632434. The cubic root of 72943081 is about 417.8252686511.

The spelling of 72943081 in words is "seventy-two million, nine hundred forty-three thousand, eighty-one".