1908121 has 2 divisors, whose sum is σ = 1908122. Its totient is φ = 1908120.

The previous prime is 1908091. The next prime is 1908133. The reversal of 1908121 is 1218091.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1904400 + 3721 = 1380^2 + 61^2 .

It is a cyclic number.

It is not a de Polignac number, because 1908121 - 2⁵ = 1908089 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1908092 and 1908101.

It is not a weakly prime, because it can be changed into another prime (1908421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 954060 + 954061.

It is an arithmetic number, because the mean of its divisors is an integer number (954061).

2^1908121 is an apocalyptic number.

It is an amenable number.

1908121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1908121 is an equidigital number, since it uses as much as digits as its factorization.

1908121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 22.

The square root of 1908121 is about 1381.3475304933. The cubic root of 1908121 is about 124.0324446839.

The spelling of 1908121 in words is "one million, nine hundred eight thousand, one hundred twenty-one".