149672009 has 2 divisors, whose sum is σ = 149672010. Its totient is φ = 149672008.

The previous prime is 149671997. The next prime is 149672023. The reversal of 149672009 is 900276941.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 94867600 + 54804409 = 9740^2 + 7403^2 .

It is an emirp because it is prime and its reverse (900276941) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 149672009 - 2¹² = 149667913 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (149672059) 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, 74836004 + 74836005.

It is an arithmetic number, because the mean of its divisors is an integer number (74836005).

Almost surely, 2^149672009 is an apocalyptic number.

It is an amenable number.

149672009 is a deficient number, since it is larger than the sum of its proper divisors (1).

149672009 is an equidigital number, since it uses as much as digits as its factorization.

149672009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 149672009 is about 12234.0512096362. The cubic root of 149672009 is about 530.9417325940.

The spelling of 149672009 in words is "one hundred forty-nine million, six hundred seventy-two thousand, nine".