103890121 has 2 divisors, whose sum is σ = 103890122. Its totient is φ = 103890120.

The previous prime is 103890113. The next prime is 103890211. The reversal of 103890121 is 121098301.

Together with next prime (103890211) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 95824521 + 8065600 = 9789^2 + 2840^2 .

It is a cyclic number.

It is not a de Polignac number, because 103890121 - 2³ = 103890113 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is not a weakly prime, because it can be changed into another prime (103890421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51945060 + 51945061.

It is an arithmetic number, because the mean of its divisors is an integer number (51945061).

Almost surely, 2^103890121 is an apocalyptic number.

It is an amenable number.

103890121 is a deficient number, since it is larger than the sum of its proper divisors (1).

103890121 is an equidigital number, since it uses as much as digits as its factorization.

103890121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 25.

The square root of 103890121 is about 10192.6503422810. The cubic root of 103890121 is about 470.1012623219.

The spelling of 103890121 in words is "one hundred three million, eight hundred ninety thousand, one hundred twenty-one".