190947109 has 4 divisors (see below), whose sum is σ = 191128140. Its totient is φ = 190766080.

The previous prime is 190947101. The next prime is 190947137. The reversal of 190947109 is 901749091.

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 143640225 + 47306884 = 11985^2 + 6878^2 .

It is a cyclic number.

It is not a de Polignac number, because 190947109 - 2³ = 190947101 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 (190947101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88924 + ... + 91045.

It is an arithmetic number, because the mean of its divisors is an integer number (47782035).

Almost surely, 2^190947109 is an apocalyptic number.

It is an amenable number.

190947109 is a deficient number, since it is larger than the sum of its proper divisors (181031).

190947109 is a wasteful number, since it uses less digits than its factorization.

190947109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181030.

The product of its (nonzero) digits is 20412, while the sum is 40.

The square root of 190947109 is about 13818.3612993727. The cubic root of 190947109 is about 575.8433587770.

The spelling of 190947109 in words is "one hundred ninety million, nine hundred forty-seven thousand, one hundred nine".