73281011 has 2 divisors, whose sum is σ = 73281012. Its totient is φ = 73281010.

The previous prime is 73281001. The next prime is 73281029. The reversal of 73281011 is 11018237.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 73281011 - 2¹⁸ = 73018867 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (73281001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36640505 + 36640506.

It is an arithmetic number, because the mean of its divisors is an integer number (36640506).

Almost surely, 2^73281011 is an apocalyptic number.

73281011 is a deficient number, since it is larger than the sum of its proper divisors (1).

73281011 is an equidigital number, since it uses as much as digits as its factorization.

73281011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 336, while the sum is 23.

The square root of 73281011 is about 8560.4328745689. The cubic root of 73281011 is about 418.4695070867.

Adding to 73281011 its reverse (11018237), we get a palindrome (84299248).

The spelling of 73281011 in words is "seventy-three million, two hundred eighty-one thousand, eleven".