203190121 has 2 divisors, whose sum is σ = 203190122. Its totient is φ = 203190120.

The previous prime is 203190107. The next prime is 203190131. The reversal of 203190121 is 121091302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 136539225 + 66650896 = 11685^2 + 8164^2 .

It is a cyclic number.

It is not a de Polignac number, because 203190121 - 2¹⁷ = 203059049 is a prime.

It is not a weakly prime, because it can be changed into another prime (203190101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101595060 + 101595061.

It is an arithmetic number, because the mean of its divisors is an integer number (101595061).

Almost surely, 2^203190121 is an apocalyptic number.

It is an amenable number.

203190121 is a deficient number, since it is larger than the sum of its proper divisors (1).

203190121 is an equidigital number, since it uses as much as digits as its factorization.

203190121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 203190121 is about 14254.4772264717. The cubic root of 203190121 is about 587.8964841992.

The spelling of 203190121 in words is "two hundred three million, one hundred ninety thousand, one hundred twenty-one".