1984181 has 2 divisors, whose sum is σ = 1984182. Its totient is φ = 1984180.

The previous prime is 1984163. The next prime is 1984183. The reversal of 1984181 is 1814891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1276900 + 707281 = 1130^2 + 841^2 .

It is a cyclic number.

It is not a de Polignac number, because 1984181 - 2⁶ = 1984117 is a prime.

It is a super-2 number, since 2×1984181² = 7873948481522, which contains 22 as substring.

Together with 1984183, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1984183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 992090 + 992091.

It is an arithmetic number, because the mean of its divisors is an integer number (992091).

2^1984181 is an apocalyptic number.

It is an amenable number.

1984181 is a deficient number, since it is larger than the sum of its proper divisors (1).

1984181 is an equidigital number, since it uses as much as digits as its factorization.

1984181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2304, while the sum is 32.

The square root of 1984181 is about 1408.6095981499. The cubic root of 1984181 is about 125.6590471481.

The spelling of 1984181 in words is "one million, nine hundred eighty-four thousand, one hundred eighty-one".