189372549409 has 2 divisors, whose sum is σ = 189372549410. Its totient is φ = 189372549408.

The previous prime is 189372549391. The next prime is 189372549493. The reversal of 189372549409 is 904945273981.

189372549409 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 184789936384 + 4582613025 = 429872^2 + 67695^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-189372549409 is a prime.

It is not a weakly prime, because it can be changed into another prime (189372549109) 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, 94686274704 + 94686274705.

It is an arithmetic number, because the mean of its divisors is an integer number (94686274705).

Almost surely, 2^189372549409 is an apocalyptic number.

It is an amenable number.

189372549409 is a deficient number, since it is larger than the sum of its proper divisors (1).

189372549409 is an equidigital number, since it uses as much as digits as its factorization.

189372549409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19595520, while the sum is 61.

The spelling of 189372549409 in words is "one hundred eighty-nine billion, three hundred seventy-two million, five hundred forty-nine thousand, four hundred nine".