149185009 has 2 divisors, whose sum is σ = 149185010. Its totient is φ = 149185008.

The previous prime is 149184991. The next prime is 149185037. The reversal of 149185009 is 900581941.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 87609600 + 61575409 = 9360^2 + 7847^2 .

It is a cyclic number.

It is not a de Polignac number, because 149185009 - 2⁷ = 149184881 is a prime.

It is not a weakly prime, because it can be changed into another prime (149185109) 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, 74592504 + 74592505.

It is an arithmetic number, because the mean of its divisors is an integer number (74592505).

Almost surely, 2^149185009 is an apocalyptic number.

It is an amenable number.

149185009 is a deficient number, since it is larger than the sum of its proper divisors (1).

149185009 is an equidigital number, since it uses as much as digits as its factorization.

149185009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 37.

The square root of 149185009 is about 12214.1315286843. The cubic root of 149185009 is about 530.3652507800.

The spelling of 149185009 in words is "one hundred forty-nine million, one hundred eighty-five thousand, nine".