73045781 has 2 divisors, whose sum is σ = 73045782. Its totient is φ = 73045780.

The previous prime is 73045729. The next prime is 73045789. The reversal of 73045781 is 18754037.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72420100 + 625681 = 8510^2 + 791^2 .

It is a cyclic number.

It is not a de Polignac number, because 73045781 - 2¹⁸ = 72783637 is a prime.

It is a super-2 number, since 2×73045781² = 10671372243799922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73045789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36522890 + 36522891.

It is an arithmetic number, because the mean of its divisors is an integer number (36522891).

Almost surely, 2^73045781 is an apocalyptic number.

It is an amenable number.

73045781 is a deficient number, since it is larger than the sum of its proper divisors (1).

73045781 is an equidigital number, since it uses as much as digits as its factorization.

73045781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23520, while the sum is 35.

The square root of 73045781 is about 8546.6824557836. The cubic root of 73045781 is about 418.0212686537.

The spelling of 73045781 in words is "seventy-three million, forty-five thousand, seven hundred eighty-one".