1881601 has 2 divisors, whose sum is σ = 1881602. Its totient is φ = 1881600.

The previous prime is 1881587. The next prime is 1881617. The reversal of 1881601 is 1061881.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 998001 + 883600 = 999^2 + 940^2 .

It is an emirp because it is prime and its reverse (1061881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1881601 - 2¹³ = 1873409 is a prime.

1881601 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (1881631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 940800 + 940801.

It is an arithmetic number, because the mean of its divisors is an integer number (940801).

2^1881601 is an apocalyptic number.

It is an amenable number.

1881601 is a deficient number, since it is larger than the sum of its proper divisors (1).

1881601 is an equidigital number, since it uses as much as digits as its factorization.

1881601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 25.

The square root of 1881601 is about 1371.7146204659. The cubic root of 1881601 is about 123.4551405969.

The spelling of 1881601 in words is "one million, eight hundred eighty-one thousand, six hundred one".