90221941729 has 2 divisors, whose sum is σ = 90221941730. Its totient is φ = 90221941728.

The previous prime is 90221941687. The next prime is 90221941861. The reversal of 90221941729 is 92714912209.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 85951580625 + 4270361104 = 293175^2 + 65348^2 .

It is a cyclic number.

It is not a de Polignac number, because 90221941729 - 2⁹ = 90221941217 is a prime.

It is not a weakly prime, because it can be changed into another prime (90221941129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45110970864 + 45110970865.

It is an arithmetic number, because the mean of its divisors is an integer number (45110970865).

Almost surely, 2^90221941729 is an apocalyptic number.

It is an amenable number.

90221941729 is a deficient number, since it is larger than the sum of its proper divisors (1).

90221941729 is an equidigital number, since it uses as much as digits as its factorization.

90221941729 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 163296, while the sum is 46.

The spelling of 90221941729 in words is "ninety billion, two hundred twenty-one million, nine hundred forty-one thousand, seven hundred twenty-nine".