51550205 has 24 divisors (see below), whose sum is σ = 76198968. Its totient is φ = 33266688.

The previous prime is 51550201. The next prime is 51550207. The reversal of 51550205 is 50205515.

It can be written as a sum of positive squares in 4 ways, for example, as 3136441 + 48413764 = 1771^2 + 6958^2 .

It is not a de Polignac number, because 51550205 - 2² = 51550201 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 (51550201) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2024 + ... + 10353.

It is an arithmetic number, because the mean of its divisors is an integer number (3174957).

Almost surely, 2^51550205 is an apocalyptic number.

It is an amenable number.

51550205 is a deficient number, since it is larger than the sum of its proper divisors (24648763).

51550205 is a wasteful number, since it uses less digits than its factorization.

51550205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12413 (or 12406 counting only the distinct ones).

The product of its (nonzero) digits is 1250, while the sum is 23.

The square root of 51550205 is about 7179.8471432197. The cubic root of 51550205 is about 372.1718022677.

The spelling of 51550205 in words is "fifty-one million, five hundred fifty thousand, two hundred five".