51210207 has 6 divisors (see below), whose sum is σ = 73970312. Its totient is φ = 34140132.

The previous prime is 51210197. The next prime is 51210209. The reversal of 51210207 is 70201215.

It is not a de Polignac number, because 51210207 - 2¹⁹ = 50685919 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51210207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51210209) 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 5 ways as a sum of consecutive naturals, for example, 2845003 + ... + 2845020.

Almost surely, 2^51210207 is an apocalyptic number.

51210207 is a deficient number, since it is larger than the sum of its proper divisors (22760105).

51210207 is a wasteful number, since it uses less digits than its factorization.

51210207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5690029 (or 5690026 counting only the distinct ones).

The product of its (nonzero) digits is 140, while the sum is 18.

The square root of 51210207 is about 7156.1307282637. The cubic root of 51210207 is about 371.3517804126.

The spelling of 51210207 in words is "fifty-one million, two hundred ten thousand, two hundred seven".