189134749 has 2 divisors, whose sum is σ = 189134750. Its totient is φ = 189134748.

The previous prime is 189134747. The next prime is 189134753. The reversal of 189134749 is 947431981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 147622500 + 41512249 = 12150^2 + 6443^2 .

It is a cyclic number.

It is not a de Polignac number, because 189134749 - 2¹ = 189134747 is a prime.

Together with 189134747, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 189134699 and 189134708.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (189134747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94567374 + 94567375.

It is an arithmetic number, because the mean of its divisors is an integer number (94567375).

Almost surely, 2^189134749 is an apocalyptic number.

It is an amenable number.

189134749 is a deficient number, since it is larger than the sum of its proper divisors (1).

189134749 is an equidigital number, since it uses as much as digits as its factorization.

189134749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 46.

The square root of 189134749 is about 13752.6269854163. The cubic root of 189134749 is about 574.0157063288.

The spelling of 189134749 in words is "one hundred eighty-nine million, one hundred thirty-four thousand, seven hundred forty-nine".