51209205 has 16 divisors (see below), whose sum is σ = 83934144. Its totient is φ = 26645120.

The previous prime is 51209111. The next prime is 51209233. The reversal of 51209205 is 50290215.

It is not a de Polignac number, because 51209205 - 2¹¹ = 51207157 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41019 + ... + 42248.

It is an arithmetic number, because the mean of its divisors is an integer number (5245884).

Almost surely, 2^51209205 is an apocalyptic number.

It is an amenable number.

51209205 is a deficient number, since it is larger than the sum of its proper divisors (32724939).

51209205 is a wasteful number, since it uses less digits than its factorization.

51209205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83316.

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 51209205 is about 7156.0607180208. The cubic root of 51209205 is about 371.3493583895.

The spelling of 51209205 in words is "fifty-one million, two hundred nine thousand, two hundred five".