51000261 has 16 divisors (see below), whose sum is σ = 73429440. Its totient is φ = 31299840.

The previous prime is 51000233. The next prime is 51000343. The reversal of 51000261 is 16200015.

It is not a de Polignac number, because 51000261 - 2⁶ = 51000197 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 51000261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51000211) 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, 14781 + ... + 17901.

It is an arithmetic number, because the mean of its divisors is an integer number (4589340).

Almost surely, 2^51000261 is an apocalyptic number.

It is an amenable number.

51000261 is a deficient number, since it is larger than the sum of its proper divisors (22429179).

51000261 is a wasteful number, since it uses less digits than its factorization.

51000261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3556.

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 51000261 is about 7141.4467021746. The cubic root of 51000261 is about 370.8436095400.

Adding to 51000261 its reverse (16200015), we get a palindrome (67200276).

The spelling of 51000261 in words is "fifty-one million, two hundred sixty-one", and thus it is an aban number.