51949109 has 4 divisors (see below), whose sum is σ = 51986316. Its totient is φ = 51911904.

The previous prime is 51949103. The next prime is 51949123. The reversal of 51949109 is 90194915.

51949109 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 49308484 + 2640625 = 7022^2 + 1625^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51949109 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 (51949103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16424 + ... + 19329.

It is an arithmetic number, because the mean of its divisors is an integer number (12996579).

Almost surely, 2^51949109 is an apocalyptic number.

It is an amenable number.

51949109 is a deficient number, since it is larger than the sum of its proper divisors (37207).

51949109 is a wasteful number, since it uses less digits than its factorization.

51949109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37206.

The product of its (nonzero) digits is 14580, while the sum is 38.

The square root of 51949109 is about 7207.5730311943. The cubic root of 51949109 is about 373.1293123319.

The spelling of 51949109 in words is "fifty-one million, nine hundred forty-nine thousand, one hundred nine".