189121751 has 16 divisors (see below), whose sum is σ = 234952704. Its totient is φ = 148228704.

The previous prime is 189121733. The next prime is 189121759. The reversal of 189121751 is 157121981.

It is not a de Polignac number, because 189121751 - 2¹⁸ = 188859607 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189121759) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26 + ... + 19448.

It is an arithmetic number, because the mean of its divisors is an integer number (14684544).

Almost surely, 2^189121751 is an apocalyptic number.

189121751 is a deficient number, since it is larger than the sum of its proper divisors (45830953).

189121751 is a wasteful number, since it uses less digits than its factorization.

189121751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19550.

The product of its digits is 5040, while the sum is 35.

The square root of 189121751 is about 13752.1544130365. The cubic root of 189121751 is about 574.0025565734.

The spelling of 189121751 in words is "one hundred eighty-nine million, one hundred twenty-one thousand, seven hundred fifty-one".