3129149 has 4 divisors (see below), whose sum is σ = 3150300. Its totient is φ = 3108000.

The previous prime is 3129121. The next prime is 3129169. The reversal of 3129149 is 9419213.

It is a happy number.

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 511225 + 2617924 = 715^2 + 1618^2 .

It is a cyclic number.

It is not a de Polignac number, because 3129149 - 2⁸ = 3128893 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3129169) 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, 10352 + ... + 10649.

It is an arithmetic number, because the mean of its divisors is an integer number (787575).

Almost surely, 2^3129149 is an apocalyptic number.

It is an amenable number.

3129149 is a deficient number, since it is larger than the sum of its proper divisors (21151).

3129149 is a wasteful number, since it uses less digits than its factorization.

3129149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21150.

The product of its digits is 1944, while the sum is 29.

The square root of 3129149 is about 1768.9400781259. The cubic root of 3129149 is about 146.2655609614.

Subtracting 3129149 from its reverse (9419213), we obtain a square (6290064 = 2508²).

The spelling of 3129149 in words is "three million, one hundred twenty-nine thousand, one hundred forty-nine".