189089993 has 2 divisors, whose sum is σ = 189089994. Its totient is φ = 189089992.

The previous prime is 189089981. The next prime is 189090007. The reversal of 189089993 is 399980981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 102171664 + 86918329 = 10108^2 + 9323^2 .

It is a cyclic number.

It is not a de Polignac number, because 189089993 - 2¹⁶ = 189024457 is a prime.

It is not a weakly prime, because it can be changed into another prime (189089933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94544996 + 94544997.

It is an arithmetic number, because the mean of its divisors is an integer number (94544997).

Almost surely, 2^189089993 is an apocalyptic number.

It is an amenable number.

189089993 is a deficient number, since it is larger than the sum of its proper divisors (1).

189089993 is an equidigital number, since it uses as much as digits as its factorization.

189089993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1259712, while the sum is 56.

The square root of 189089993 is about 13750.9997091121. Note that the first 3 decimals coincide. The cubic root of 189089993 is about 573.9704252549.

The spelling of 189089993 in words is "one hundred eighty-nine million, eighty-nine thousand, nine hundred ninety-three".