90000121 has 2 divisors, whose sum is σ = 90000122. Its totient is φ = 90000120.

The previous prime is 90000109. The next prime is 90000133. The reversal of 90000121 is 12100009.

It is a balanced prime because it is at equal distance from previous prime (90000109) and next prime (90000133).

It can be written as a sum of positive squares in only one way, i.e., 87160896 + 2839225 = 9336^2 + 1685^2 .

It is a cyclic number.

It is not a de Polignac number, because 90000121 - 2⁵ = 90000089 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (90000221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45000060 + 45000061.

It is an arithmetic number, because the mean of its divisors is an integer number (45000061).

Almost surely, 2^90000121 is an apocalyptic number.

It is an amenable number.

90000121 is a deficient number, since it is larger than the sum of its proper divisors (1).

90000121 is an equidigital number, since it uses as much as digits as its factorization.

90000121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18, while the sum is 13.

The square root of 90000121 is about 9486.8393577629. The cubic root of 90000121 is about 448.1406754890.

It can be divided in two parts, 90000 and 121, that multiplied together give a square (10890000 = 3300²).

The spelling of 90000121 in words is "ninety million, one hundred twenty-one", and thus it is an aban number.