73181081 has 2 divisors, whose sum is σ = 73181082. Its totient is φ = 73181080.

The previous prime is 73181071. The next prime is 73181131. The reversal of 73181081 is 18018137.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66504025 + 6677056 = 8155^2 + 2584^2 .

It is a cyclic number.

It is not a de Polignac number, because 73181081 - 2¹⁴ = 73164697 is a prime.

It is a super-2 number, since 2×73181081² = 10710941232657122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (73181011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36590540 + 36590541.

It is an arithmetic number, because the mean of its divisors is an integer number (36590541).

Almost surely, 2^73181081 is an apocalyptic number.

It is an amenable number.

73181081 is a deficient number, since it is larger than the sum of its proper divisors (1).

73181081 is an equidigital number, since it uses as much as digits as its factorization.

73181081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1344, while the sum is 29.

The square root of 73181081 is about 8554.5941458377. The cubic root of 73181081 is about 418.2792045787.

The spelling of 73181081 in words is "seventy-three million, one hundred eighty-one thousand, eighty-one".