1881617 has 2 divisors, whose sum is σ = 1881618. Its totient is φ = 1881616.

The previous prime is 1881601. The next prime is 1881619. The reversal of 1881617 is 7161881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1784896 + 96721 = 1336^2 + 311^2 .

It is a cyclic number.

It is not a de Polignac number, because 1881617 - 2⁴ = 1881601 is a prime.

Together with 1881619, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1881619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 940808 + 940809.

It is an arithmetic number, because the mean of its divisors is an integer number (940809).

2^1881617 is an apocalyptic number.

It is an amenable number.

1881617 is a deficient number, since it is larger than the sum of its proper divisors (1).

1881617 is an equidigital number, since it uses as much as digits as its factorization.

1881617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2688, while the sum is 32.

The square root of 1881617 is about 1371.7204525704. The cubic root of 1881617 is about 123.4554905253.

The spelling of 1881617 in words is "one million, eight hundred eighty-one thousand, six hundred seventeen".