981231169 has 2 divisors, whose sum is σ = 981231170. Its totient is φ = 981231168.

The previous prime is 981231133. The next prime is 981231187. The reversal of 981231169 is 961132189.

981231169 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 928116225 + 53114944 = 30465^2 + 7288^2 .

It is a cyclic number.

It is not a de Polignac number, because 981231169 - 2²¹ = 979134017 is a prime.

It is a super-2 number, since 2×981231169² = 1925629214034213122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (981232169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490615584 + 490615585.

It is an arithmetic number, because the mean of its divisors is an integer number (490615585).

Almost surely, 2^981231169 is an apocalyptic number.

It is an amenable number.

981231169 is a deficient number, since it is larger than the sum of its proper divisors (1).

981231169 is an equidigital number, since it uses as much as digits as its factorization.

981231169 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23328, while the sum is 40.

The square root of 981231169 is about 31324.6096384297. The cubic root of 981231169 is about 993.7041686918.

The spelling of 981231169 in words is "nine hundred eighty-one million, two hundred thirty-one thousand, one hundred sixty-nine".