3128149 has 4 divisors (see below), whose sum is σ = 3152160. Its totient is φ = 3104140.

The previous prime is 3128131. The next prime is 3128159. The reversal of 3128149 is 9418213.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 3128149 - 2⁹ = 3127637 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 (3128129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11809 + ... + 12070.

It is an arithmetic number, because the mean of its divisors is an integer number (788040).

Almost surely, 2^3128149 is an apocalyptic number.

It is an amenable number.

3128149 is a deficient number, since it is larger than the sum of its proper divisors (24011).

3128149 is a wasteful number, since it uses less digits than its factorization.

3128149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24010.

The product of its digits is 1728, while the sum is 28.

The square root of 3128149 is about 1768.6574004029. The cubic root of 3128149 is about 146.2499783281.

Subtracting 3128149 from its reverse (9418213), we obtain a square (6290064 = 2508²).

The spelling of 3128149 in words is "three million, one hundred twenty-eight thousand, one hundred forty-nine".