981123959 has 2 divisors, whose sum is σ = 981123960. Its totient is φ = 981123958.

The previous prime is 981123943. The next prime is 981123961. The reversal of 981123959 is 959321189.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 981123959 - 2⁴ = 981123943 is a prime.

It is a super-3 number, since 3×981123959³ (a number of 28 digits) contains 333 as substring.

It is a Sophie Germain prime.

Together with 981123961, 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 (981123359) 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, 490561979 + 490561980.

It is an arithmetic number, because the mean of its divisors is an integer number (490561980).

Almost surely, 2^981123959 is an apocalyptic number.

981123959 is a deficient number, since it is larger than the sum of its proper divisors (1).

981123959 is an equidigital number, since it uses as much as digits as its factorization.

981123959 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 174960, while the sum is 47.

The square root of 981123959 is about 31322.8983173652. The cubic root of 981123959 is about 993.6679764374.

The spelling of 981123959 in words is "nine hundred eighty-one million, one hundred twenty-three thousand, nine hundred fifty-nine".