2193881 has 2 divisors, whose sum is σ = 2193882. Its totient is φ = 2193880.

The previous prime is 2193853. The next prime is 2193883. The reversal of 2193881 is 1883912.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2190400 + 3481 = 1480^2 + 59^2 .

It is a cyclic number.

It is not a de Polignac number, because 2193881 - 2¹⁰ = 2192857 is a prime.

It is a super-2 number, since 2×2193881² = 9626227684322, which contains 22 as substring.

Together with 2193883, 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 (2193883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1096940 + 1096941.

It is an arithmetic number, because the mean of its divisors is an integer number (1096941).

2^2193881 is an apocalyptic number.

It is an amenable number.

2193881 is a deficient number, since it is larger than the sum of its proper divisors (1).

2193881 is an equidigital number, since it uses as much as digits as its factorization.

2193881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 32.

The square root of 2193881 is about 1481.1755466521. The cubic root of 2193881 is about 129.9384521274.

The spelling of 2193881 in words is "two million, one hundred ninety-three thousand, eight hundred eighty-one".