189651709 has 4 divisors (see below), whose sum is σ = 204240316. Its totient is φ = 175063104.

The previous prime is 189651697. The next prime is 189651719. The reversal of 189651709 is 907156981.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 30008484 + 159643225 = 5478^2 + 12635^2 .

It is a cyclic number.

It is not a de Polignac number, because 189651709 - 2⁹ = 189651197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189651719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7294284 + ... + 7294309.

It is an arithmetic number, because the mean of its divisors is an integer number (51060079).

Almost surely, 2^189651709 is an apocalyptic number.

It is an amenable number.

189651709 is a deficient number, since it is larger than the sum of its proper divisors (14588607).

189651709 is a wasteful number, since it uses less digits than its factorization.

189651709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14588606.

The product of its (nonzero) digits is 136080, while the sum is 46.

The square root of 189651709 is about 13771.4091145387. The cubic root of 189651709 is about 574.5382142397.

The spelling of 189651709 in words is "one hundred eighty-nine million, six hundred fifty-one thousand, seven hundred nine".