149689209 has 8 divisors (see below), whose sum is σ = 200236960. Its totient is φ = 99467136.

The previous prime is 149689187. The next prime is 149689223. The reversal of 149689209 is 902986941.

149689209 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 149689209 - 2⁷ = 149689081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (149689259) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80344 + ... + 82185.

It is an arithmetic number, because the mean of its divisors is an integer number (25029620).

Almost surely, 2^149689209 is an apocalyptic number.

It is an amenable number.

149689209 is a deficient number, since it is larger than the sum of its proper divisors (50547751).

149689209 is a wasteful number, since it uses less digits than its factorization.

149689209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162839.

The product of its (nonzero) digits is 279936, while the sum is 48.

The square root of 149689209 is about 12234.7541454661. The cubic root of 149689209 is about 530.9620700596.

The spelling of 149689209 in words is "one hundred forty-nine million, six hundred eighty-nine thousand, two hundred nine".