1897121 has 2 divisors, whose sum is σ = 1897122. Its totient is φ = 1897120.

The previous prime is 1897099. The next prime is 1897127. The reversal of 1897121 is 1217981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1784896 + 112225 = 1336^2 + 335^2 .

It is a cyclic number.

It is not a de Polignac number, because 1897121 - 2⁶ = 1897057 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1897127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 948560 + 948561.

It is an arithmetic number, because the mean of its divisors is an integer number (948561).

2^1897121 is an apocalyptic number.

It is an amenable number.

1897121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1897121 is an equidigital number, since it uses as much as digits as its factorization.

1897121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1008, while the sum is 29.

The square root of 1897121 is about 1377.3601562409. The cubic root of 1897121 is about 123.7936430768.

The spelling of 1897121 in words is "one million, eight hundred ninety-seven thousand, one hundred twenty-one".