981475189 has 2 divisors, whose sum is σ = 981475190. Its totient is φ = 981475188.

The previous prime is 981475171. The next prime is 981475193. The reversal of 981475189 is 981574189.

981475189 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., 927202500 + 54272689 = 30450^2 + 7367^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-981475189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (981475109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490737594 + 490737595.

It is an arithmetic number, because the mean of its divisors is an integer number (490737595).

Almost surely, 2^981475189 is an apocalyptic number.

It is an amenable number.

981475189 is a deficient number, since it is larger than the sum of its proper divisors (1).

981475189 is an equidigital number, since it uses as much as digits as its factorization.

981475189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 725760, while the sum is 52.

The square root of 981475189 is about 31328.5044169044. The cubic root of 981475189 is about 993.7865358243.

The spelling of 981475189 in words is "nine hundred eighty-one million, four hundred seventy-five thousand, one hundred eighty-nine".