73381999 has 2 divisors, whose sum is σ = 73382000. Its totient is φ = 73381998.

The previous prime is 73381969. The next prime is 73382011. The reversal of 73381999 is 99918337.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 73381999 - 2¹⁷ = 73250927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73381949) 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, 36690999 + 36691000.

It is an arithmetic number, because the mean of its divisors is an integer number (36691000).

Almost surely, 2^73381999 is an apocalyptic number.

73381999 is a deficient number, since it is larger than the sum of its proper divisors (1).

73381999 is an equidigital number, since it uses as much as digits as its factorization.

73381999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 367416, while the sum is 49.

The square root of 73381999 is about 8566.3293772771. The cubic root of 73381999 is about 418.6616487249.

The spelling of 73381999 in words is "seventy-three million, three hundred eighty-one thousand, nine hundred ninety-nine".