1984091 has 2 divisors, whose sum is σ = 1984092. Its totient is φ = 1984090.

The previous prime is 1984079. The next prime is 1984109. The reversal of 1984091 is 1904891.

Together with next prime (1984109) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is an emirp because it is prime and its reverse (1904891) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1984091 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1984061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 992045 + 992046.

It is an arithmetic number, because the mean of its divisors is an integer number (992046).

2^1984091 is an apocalyptic number.

1984091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1984091 is an equidigital number, since it uses as much as digits as its factorization.

1984091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 1984091 is about 1408.5776513916. The cubic root of 1984091 is about 125.6571472063.

It can be divided in two parts, 198 and 4091, that multiplied together give a palindrome (810018).

The spelling of 1984091 in words is "one million, nine hundred eighty-four thousand, ninety-one".