73781651 has 2 divisors, whose sum is σ = 73781652. Its totient is φ = 73781650.

The previous prime is 73781639. The next prime is 73781699. The reversal of 73781651 is 15618737.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 73781651 - 2¹⁴ = 73765267 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (73781621) 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, 36890825 + 36890826.

It is an arithmetic number, because the mean of its divisors is an integer number (36890826).

Almost surely, 2^73781651 is an apocalyptic number.

73781651 is a deficient number, since it is larger than the sum of its proper divisors (1).

73781651 is an equidigital number, since it uses as much as digits as its factorization.

73781651 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 35280, while the sum is 38.

The square root of 73781651 is about 8589.6246134508. The cubic root of 73781651 is about 419.4203094917.

The spelling of 73781651 in words is "seventy-three million, seven hundred eighty-one thousand, six hundred fifty-one".