1881697 has 2 divisors, whose sum is σ = 1881698. Its totient is φ = 1881696.

The previous prime is 1881641. The next prime is 1881749. The reversal of 1881697 is 7961881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1615441 + 266256 = 1271^2 + 516^2 .

It is an emirp because it is prime and its reverse (7961881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1881697 - 2¹⁵ = 1848929 is a prime.

It is not a weakly prime, because it can be changed into another prime (1881617) 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, 940848 + 940849.

It is an arithmetic number, because the mean of its divisors is an integer number (940849).

2^1881697 is an apocalyptic number.

It is an amenable number.

1881697 is a deficient number, since it is larger than the sum of its proper divisors (1).

1881697 is an equidigital number, since it uses as much as digits as its factorization.

1881697 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24192, while the sum is 40.

The square root of 1881697 is about 1371.7496127209. The cubic root of 1881697 is about 123.4572401373.

The spelling of 1881697 in words is "one million, eight hundred eighty-one thousand, six hundred ninety-seven".