1681877 has 2 divisors, whose sum is σ = 1681878. Its totient is φ = 1681876.

The previous prime is 1681873. The next prime is 1681879. The reversal of 1681877 is 7781861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1378276 + 303601 = 1174^2 + 551^2 .

It is an emirp because it is prime and its reverse (7781861) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1681877 - 2² = 1681873 is a prime.

Together with 1681879, it forms a pair of twin primes.

It is a Chen prime.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 1681877.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1681871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 840938 + 840939.

It is an arithmetic number, because the mean of its divisors is an integer number (840939).

2^1681877 is an apocalyptic number.

It is an amenable number.

1681877 is a deficient number, since it is larger than the sum of its proper divisors (1).

1681877 is an equidigital number, since it uses as much as digits as its factorization.

1681877 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18816, while the sum is 38.

The square root of 1681877 is about 1296.8720060206. The cubic root of 1681877 is about 118.9226953611.

The spelling of 1681877 in words is "one million, six hundred eighty-one thousand, eight hundred seventy-seven".