1881311 has 2 divisors, whose sum is σ = 1881312. Its totient is φ = 1881310.

The previous prime is 1881307. The next prime is 1881329. The reversal of 1881311 is 1131881.

It is a weak prime.

It is an emirp because it is prime and its reverse (1131881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1881311 - 2² = 1881307 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1881391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 940655 + 940656.

It is an arithmetic number, because the mean of its divisors is an integer number (940656).

2^1881311 is an apocalyptic number.

1881311 is a deficient number, since it is larger than the sum of its proper divisors (1).

1881311 is an equidigital number, since it uses as much as digits as its factorization.

1881311 is an evil number, because the sum of its binary digits is even.

The product of its digits is 192, while the sum is 23.

The square root of 1881311 is about 1371.6089092741. The cubic root of 1881311 is about 123.4487978016.

The spelling of 1881311 in words is "one million, eight hundred eighty-one thousand, three hundred eleven".