149550509 has 4 divisors (see below), whose sum is σ = 149696316. Its totient is φ = 149404704.

The previous prime is 149550487. The next prime is 149550521. The reversal of 149550509 is 905055941.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 118156900 + 31393609 = 10870^2 + 5603^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-149550509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (149550529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71354 + ... + 73419.

It is an arithmetic number, because the mean of its divisors is an integer number (37424079).

Almost surely, 2^149550509 is an apocalyptic number.

It is an amenable number.

149550509 is a deficient number, since it is larger than the sum of its proper divisors (145807).

149550509 is a wasteful number, since it uses less digits than its factorization.

149550509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145806.

The product of its (nonzero) digits is 40500, while the sum is 38.

The square root of 149550509 is about 12229.0845528192. The cubic root of 149550509 is about 530.7980252869.

The spelling of 149550509 in words is "one hundred forty-nine million, five hundred fifty thousand, five hundred nine".