51909625 has 16 divisors (see below), whose sum is σ = 65070720. Its totient is φ = 41343600.

The previous prime is 51909607. The next prime is 51909629. The reversal of 51909625 is 52690915.

51909625 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51909625 - 2¹³ = 51901433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51909629) 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 15 ways as a sum of consecutive naturals, for example, 32086 + ... + 33664.

It is an arithmetic number, because the mean of its divisors is an integer number (4066920).

Almost surely, 2^51909625 is an apocalyptic number.

It is an amenable number.

51909625 is a deficient number, since it is larger than the sum of its proper divisors (13161095).

51909625 is a wasteful number, since it uses less digits than its factorization.

51909625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1857 (or 1847 counting only the distinct ones).

The product of its (nonzero) digits is 24300, while the sum is 37.

The square root of 51909625 is about 7204.8334470687. The cubic root of 51909625 is about 373.0347558698.

The spelling of 51909625 in words is "fifty-one million, nine hundred nine thousand, six hundred twenty-five".