981409123 has 2 divisors, whose sum is σ = 981409124. Its totient is φ = 981409122.

The previous prime is 981409111. The next prime is 981409157. The reversal of 981409123 is 321904189.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 981409123 - 2⁹ = 981408611 is a prime.

It is not a weakly prime, because it can be changed into another prime (981409183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490704561 + 490704562.

It is an arithmetic number, because the mean of its divisors is an integer number (490704562).

Almost surely, 2^981409123 is an apocalyptic number.

981409123 is a deficient number, since it is larger than the sum of its proper divisors (1).

981409123 is an equidigital number, since it uses as much as digits as its factorization.

981409123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 981409123 is about 31327.4499919799. The cubic root of 981409123 is about 993.7642370862.

The spelling of 981409123 in words is "nine hundred eighty-one million, four hundred nine thousand, one hundred twenty-three".