51321029 has 4 divisors (see below), whose sum is σ = 51829260. Its totient is φ = 50812800.

The previous prime is 51320999. The next prime is 51321037. The reversal of 51321029 is 92012315.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 92012315 = 5 ⋅18402463.

It can be written as a sum of positive squares in 2 ways, for example, as 22944100 + 28376929 = 4790^2 + 5327^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51321029 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51320995 and 51321013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51321629) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 253964 + ... + 254165.

It is an arithmetic number, because the mean of its divisors is an integer number (12957315).

Almost surely, 2^51321029 is an apocalyptic number.

It is an amenable number.

51321029 is a deficient number, since it is larger than the sum of its proper divisors (508231).

51321029 is a wasteful number, since it uses less digits than its factorization.

51321029 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 508230.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 51321029 is about 7163.8696945157. The cubic root of 51321029 is about 371.6194633513.

The spelling of 51321029 in words is "fifty-one million, three hundred twenty-one thousand, twenty-nine".