1209370189 has 2 divisors, whose sum is σ = 1209370190. Its totient is φ = 1209370188.

The previous prime is 1209370139. The next prime is 1209370229. The reversal of 1209370189 is 9810739021.

It is an a-pointer prime, because the next prime (1209370229) can be obtained adding 1209370189 to its sum of digits (40).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 938932164 + 270438025 = 30642^2 + 16445^2 .

It is a cyclic number.

It is not a de Polignac number, because 1209370189 - 2¹¹ = 1209368141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1209370139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 604685094 + 604685095.

It is an arithmetic number, because the mean of its divisors is an integer number (604685095).

Almost surely, 2^1209370189 is an apocalyptic number.

It is an amenable number.

1209370189 is a deficient number, since it is larger than the sum of its proper divisors (1).

1209370189 is an equidigital number, since it uses as much as digits as its factorization.

1209370189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 40.

The square root of 1209370189 is about 34776.0001869105. Note that the first 3 decimals coincide. The cubic root of 1209370189 is about 1065.4173209303.

The spelling of 1209370189 in words is "one billion, two hundred nine million, three hundred seventy thousand, one hundred eighty-nine".