1905121 has 2 divisors, whose sum is σ = 1905122. Its totient is φ = 1905120.

The previous prime is 1905109. The next prime is 1905131. The reversal of 1905121 is 1215091.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1500625 + 404496 = 1225^2 + 636^2 .

It is a cyclic number.

It is not a de Polignac number, because 1905121 - 2¹¹ = 1903073 is a prime.

It is not a weakly prime, because it can be changed into another prime (1905131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 952560 + 952561.

It is an arithmetic number, because the mean of its divisors is an integer number (952561).

2^1905121 is an apocalyptic number.

It is an amenable number.

1905121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1905121 is an equidigital number, since it uses as much as digits as its factorization.

1905121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90, while the sum is 19.

The square root of 1905121 is about 1380.2612071633. The cubic root of 1905121 is about 123.9674081878.

The spelling of 1905121 in words is "one million, nine hundred five thousand, one hundred twenty-one".