86790221393 has 2 divisors, whose sum is σ = 86790221394. Its totient is φ = 86790221392.

The previous prime is 86790221389. The next prime is 86790221437. The reversal of 86790221393 is 39312209768.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 82594161664 + 4196059729 = 287392^2 + 64777^2 .

It is a cyclic number.

It is not a de Polignac number, because 86790221393 - 2² = 86790221389 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (86790221993) 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, 43395110696 + 43395110697.

It is an arithmetic number, because the mean of its divisors is an integer number (43395110697).

Almost surely, 2^86790221393 is an apocalyptic number.

It is an amenable number.

86790221393 is a deficient number, since it is larger than the sum of its proper divisors (1).

86790221393 is an equidigital number, since it uses as much as digits as its factorization.

86790221393 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 979776, while the sum is 50.

The spelling of 86790221393 in words is "eighty-six billion, seven hundred ninety million, two hundred twenty-one thousand, three hundred ninety-three".