189890741 has 2 divisors, whose sum is σ = 189890742. Its totient is φ = 189890740.

The previous prime is 189890719. The next prime is 189890747. The reversal of 189890741 is 147098981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 163584100 + 26306641 = 12790^2 + 5129^2 .

It is an emirp because it is prime and its reverse (147098981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 189890741 - 2⁶ = 189890677 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (189890747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94945370 + 94945371.

It is an arithmetic number, because the mean of its divisors is an integer number (94945371).

Almost surely, 2^189890741 is an apocalyptic number.

It is an amenable number.

189890741 is a deficient number, since it is larger than the sum of its proper divisors (1).

189890741 is an equidigital number, since it uses as much as digits as its factorization.

189890741 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 47.

The square root of 189890741 is about 13780.0849416831. The cubic root of 189890741 is about 574.7794904938.

The spelling of 189890741 in words is "one hundred eighty-nine million, eight hundred ninety thousand, seven hundred forty-one".