73781369 has 2 divisors, whose sum is σ = 73781370. Its totient is φ = 73781368.

The previous prime is 73781363. The next prime is 73781371. The reversal of 73781369 is 96318737.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69939769 + 3841600 = 8363^2 + 1960^2 .

It is a cyclic number.

It is not a de Polignac number, because 73781369 - 2²⁴ = 57004153 is a prime.

It is a super-2 number, since 2×73781369² = 10887380823028322, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 73781371, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (73781363) 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, 36890684 + 36890685.

It is an arithmetic number, because the mean of its divisors is an integer number (36890685).

Almost surely, 2^73781369 is an apocalyptic number.

It is an amenable number.

73781369 is a deficient number, since it is larger than the sum of its proper divisors (1).

73781369 is an equidigital number, since it uses as much as digits as its factorization.

73781369 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 190512, while the sum is 44.

The square root of 73781369 is about 8589.6081982824. The cubic root of 73781369 is about 419.4197751372.

The spelling of 73781369 in words is "seventy-three million, seven hundred eighty-one thousand, three hundred sixty-nine".