51260000209 has 16 divisors (see below), whose sum is σ = 56038738176. Its totient is φ = 46501174800.

The previous prime is 51260000191. The next prime is 51260000221. The reversal of 51260000209 is 90200006215.

It is a cyclic number.

It is not a de Polignac number, because 51260000209 - 2¹¹ = 51259998161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51260000299) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13037974 + ... + 13041904.

It is an arithmetic number, because the mean of its divisors is an integer number (3502421136).

Almost surely, 2^51260000209 is an apocalyptic number.

It is an amenable number.

51260000209 is a deficient number, since it is larger than the sum of its proper divisors (4778737967).

51260000209 is a wasteful number, since it uses less digits than its factorization.

With its predecessor (51260000208) it forms a Ruth-Aaron pair, since the sum of their prime factors is the same (6156).

51260000209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6156.

The product of its (nonzero) digits is 1080, while the sum is 25.

The spelling of 51260000209 in words is "fifty-one billion, two hundred sixty million, two hundred nine", and thus it is an aban number.