51378329 has 4 divisors (see below), whose sum is σ = 51723300. Its totient is φ = 51033360.

The previous prime is 51378323. The next prime is 51378391. The reversal of 51378329 is 92387315.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 92387315 = 5 ⋅18477463.

It can be written as a sum of positive squares in 2 ways, for example, as 2755600 + 48622729 = 1660^2 + 6973^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51378329 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51378292 and 51378301.

It is not an unprimeable number, because it can be changed into a prime (51378323) 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, 172262 + ... + 172559.

It is an arithmetic number, because the mean of its divisors is an integer number (12930825).

Almost surely, 2^51378329 is an apocalyptic number.

It is an amenable number.

51378329 is a deficient number, since it is larger than the sum of its proper divisors (344971).

51378329 is a wasteful number, since it uses less digits than its factorization.

51378329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344970.

The product of its digits is 45360, while the sum is 38.

The square root of 51378329 is about 7167.8678140714. The cubic root of 51378329 is about 371.7577164594.

The spelling of 51378329 in words is "fifty-one million, three hundred seventy-eight thousand, three hundred twenty-nine".