51000129 has 6 divisors (see below), whose sum is σ = 73666866. Its totient is φ = 34000080.

The previous prime is 51000127. The next prime is 51000133. The reversal of 51000129 is 92100015.

It can be written as a sum of positive squares in only one way, i.e., 36000000 + 15000129 = 6000^2 + 3873^2 .

It is not a de Polignac number, because 51000129 - 2¹ = 51000127 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51000127) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2833332 + ... + 2833349.

It is an arithmetic number, because the mean of its divisors is an integer number (12277811).

Almost surely, 2^51000129 is an apocalyptic number.

It is an amenable number.

51000129 is a deficient number, since it is larger than the sum of its proper divisors (22666737).

51000129 is a wasteful number, since it uses less digits than its factorization.

51000129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5666687 (or 5666684 counting only the distinct ones).

The product of its (nonzero) digits is 90, while the sum is 18.

The square root of 51000129 is about 7141.4374603437. The cubic root of 51000129 is about 370.8432895979.

The spelling of 51000129 in words is "fifty-one million, one hundred twenty-nine", and thus it is an aban number.