90686909221 has 2 divisors, whose sum is σ = 90686909222. Its totient is φ = 90686909220.

The previous prime is 90686909179. The next prime is 90686909263. The reversal of 90686909221 is 12290968609.

It is a balanced prime because it is at equal distance from previous prime (90686909179) and next prime (90686909263).

It can be written as a sum of positive squares in only one way, i.e., 88217316196 + 2469593025 = 297014^2 + 49695^2 .

It is a cyclic number.

It is not a de Polignac number, because 90686909221 - 2⁹ = 90686908709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90686909321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45343454610 + 45343454611.

It is an arithmetic number, because the mean of its divisors is an integer number (45343454611).

Almost surely, 2^90686909221 is an apocalyptic number.

It is an amenable number.

90686909221 is a deficient number, since it is larger than the sum of its proper divisors (1).

90686909221 is an equidigital number, since it uses as much as digits as its factorization.

90686909221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 839808, while the sum is 52.

The spelling of 90686909221 in words is "ninety billion, six hundred eighty-six million, nine hundred nine thousand, two hundred twenty-one".