189129487 has 2 divisors, whose sum is σ = 189129488. Its totient is φ = 189129486.

The previous prime is 189129467. The next prime is 189129557. The reversal of 189129487 is 784921981.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 189129487 - 2¹¹ = 189127439 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 189129487.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (189129427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94564743 + 94564744.

It is an arithmetic number, because the mean of its divisors is an integer number (94564744).

Almost surely, 2^189129487 is an apocalyptic number.

189129487 is a deficient number, since it is larger than the sum of its proper divisors (1).

189129487 is an equidigital number, since it uses as much as digits as its factorization.

189129487 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 290304, while the sum is 49.

The square root of 189129487 is about 13752.4356751813. The cubic root of 189129487 is about 574.0103829660.

The spelling of 189129487 in words is "one hundred eighty-nine million, one hundred twenty-nine thousand, four hundred eighty-seven".