90281082121 has 2 divisors, whose sum is σ = 90281082122. Its totient is φ = 90281082120.

The previous prime is 90281082091. The next prime is 90281082131. The reversal of 90281082121 is 12128018209.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 90098426896 + 182655225 = 300164^2 + 13515^2 .

It is an emirp because it is prime and its reverse (12128018209) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90281082121 - 2⁹ = 90281081609 is a prime.

It is not a weakly prime, because it can be changed into another prime (90281082131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45140541060 + 45140541061.

It is an arithmetic number, because the mean of its divisors is an integer number (45140541061).

Almost surely, 2^90281082121 is an apocalyptic number.

It is an amenable number.

90281082121 is a deficient number, since it is larger than the sum of its proper divisors (1).

90281082121 is an equidigital number, since it uses as much as digits as its factorization.

90281082121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4608, while the sum is 34.

The spelling of 90281082121 in words is "ninety billion, two hundred eighty-one million, eighty-two thousand, one hundred twenty-one".