149173409 has 32 divisors (see below), whose sum is σ = 190771200. Its totient is φ = 113293440.

The previous prime is 149173403. The next prime is 149173411. The reversal of 149173409 is 904371941.

It is a cyclic number.

It is not a de Polignac number, because 149173409 - 2¹² = 149169313 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (149173403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 833282 + ... + 833460.

It is an arithmetic number, because the mean of its divisors is an integer number (5961600).

Almost surely, 2^149173409 is an apocalyptic number.

It is an amenable number.

149173409 is a deficient number, since it is larger than the sum of its proper divisors (41597791).

149173409 is a wasteful number, since it uses less digits than its factorization.

149173409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 413.

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

The square root of 149173409 is about 12213.6566596577. The cubic root of 149173409 is about 530.3515040986.

The spelling of 149173409 in words is "one hundred forty-nine million, one hundred seventy-three thousand, four hundred nine".