1881161 has 2 divisors, whose sum is σ = 1881162. Its totient is φ = 1881160.

The previous prime is 1881157. The next prime is 1881163. The reversal of 1881161 is 1611881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 990025 + 891136 = 995^2 + 944^2 .

It is an emirp because it is prime and its reverse (1611881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1881161 - 2² = 1881157 is a prime.

Together with 1881163, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1881161.

It is not a weakly prime, because it can be changed into another prime (1881163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 940580 + 940581.

It is an arithmetic number, because the mean of its divisors is an integer number (940581).

2^1881161 is an apocalyptic number.

It is an amenable number.

1881161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1881161 is an equidigital number, since it uses as much as digits as its factorization.

1881161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 384, while the sum is 26.

The square root of 1881161 is about 1371.5542278743. The cubic root of 1881161 is about 123.4455167896.

The spelling of 1881161 in words is "one million, eight hundred eighty-one thousand, one hundred sixty-one".