180919009 has 2 divisors, whose sum is σ = 180919010. Its totient is φ = 180919008.

The previous prime is 180918953. The next prime is 180919021. The reversal of 180919009 is 900919081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 116035984 + 64883025 = 10772^2 + 8055^2 .

It is a cyclic number.

It is not a de Polignac number, because 180919009 - 2¹³ = 180910817 is a prime.

It is not a weakly prime, because it can be changed into another prime (180919709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90459504 + 90459505.

It is an arithmetic number, because the mean of its divisors is an integer number (90459505).

Almost surely, 2^180919009 is an apocalyptic number.

It is an amenable number.

180919009 is a deficient number, since it is larger than the sum of its proper divisors (1).

180919009 is an equidigital number, since it uses as much as digits as its factorization.

180919009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 37.

The square root of 180919009 is about 13450.6137034709. The cubic root of 180919009 is about 565.5808983614.

The spelling of 180919009 in words is "one hundred eighty million, nine hundred nineteen thousand, nine".