149509 has 4 divisors (see below), whose sum is σ = 150304. Its totient is φ = 148716.

The previous prime is 149503. The next prime is 149519. The reversal of 149509 is 905941.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 905941 = 877 ⋅1033.

It is a cyclic number.

It is not a de Polignac number, because 149509 - 2⁷ = 149381 is a prime.

It is a Duffinian number.

149509 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (149503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64 + ... + 550.

It is an arithmetic number, because the mean of its divisors is an integer number (37576).

2¹⁴⁹⁵⁰⁹ is an apocalyptic number.

It is an amenable number.

149509 is a deficient number, since it is larger than the sum of its proper divisors (795).

149509 is an equidigital number, since it uses as much as digits as its factorization.

149509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 794.

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 149509 is about 386.6639367720. The cubic root of 149509 is about 53.0748911592.

The spelling of 149509 in words is "one hundred forty-nine thousand, five hundred nine".