51145321 has 8 divisors (see below), whose sum is σ = 54642080. Its totient is φ = 47729088.

The previous prime is 51145309. The next prime is 51145343. The reversal of 51145321 is 12354115.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51145321 - 2⁹ = 51144809 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51145292 and 51145301.

It is not an unprimeable number, because it can be changed into a prime (51145021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18816 + ... + 21361.

It is an arithmetic number, because the mean of its divisors is an integer number (6830260).

Almost surely, 2^51145321 is an apocalyptic number.

It is an amenable number.

51145321 is a deficient number, since it is larger than the sum of its proper divisors (3496759).

51145321 is a wasteful number, since it uses less digits than its factorization.

51145321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40263.

The product of its digits is 600, while the sum is 22.

The square root of 51145321 is about 7151.5956960667. The cubic root of 51145321 is about 371.1948734406.

Adding to 51145321 its reverse (12354115), we get a palindrome (63499436).

The spelling of 51145321 in words is "fifty-one million, one hundred forty-five thousand, three hundred twenty-one".