190085009 has 2 divisors, whose sum is σ = 190085010. Its totient is φ = 190085008.

The previous prime is 190085003. The next prime is 190085011. The reversal of 190085009 is 900580091.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 107329600 + 82755409 = 10360^2 + 9097^2 .

It is an emirp because it is prime and its reverse (900580091) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 190085009 - 2⁸ = 190084753 is a prime.

It is a super-2 number, since 2×190085009² = 72264621293060162, which contains 22 as substring.

Together with 190085011, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (190085003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95042504 + 95042505.

It is an arithmetic number, because the mean of its divisors is an integer number (95042505).

Almost surely, 2^190085009 is an apocalyptic number.

It is an amenable number.

190085009 is a deficient number, since it is larger than the sum of its proper divisors (1).

190085009 is an equidigital number, since it uses as much as digits as its factorization.

190085009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 32.

The square root of 190085009 is about 13787.1320077817. The cubic root of 190085009 is about 574.9754333550.

The spelling of 190085009 in words is "one hundred ninety million, eighty-five thousand, nine".