51545321 has 4 divisors (see below), whose sum is σ = 51759444. Its totient is φ = 51331200.

The previous prime is 51545303. The next prime is 51545341. The reversal of 51545321 is 12354515.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12354515 = 5 ⋅2470903.

It can be written as a sum of positive squares in 2 ways, for example, as 18826921 + 32718400 = 4339^2 + 5720^2 .

It is a cyclic number.

It is not a de Polignac number, because 51545321 - 2⁶ = 51545257 is a prime.

It is a super-3 number, since 3×51545321³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51545341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106700 + ... + 107181.

It is an arithmetic number, because the mean of its divisors is an integer number (12939861).

Almost surely, 2^51545321 is an apocalyptic number.

It is an amenable number.

51545321 is a deficient number, since it is larger than the sum of its proper divisors (214123).

51545321 is a wasteful number, since it uses less digits than its factorization.

51545321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214122.

The product of its digits is 3000, while the sum is 26.

The square root of 51545321 is about 7179.5070165019. The cubic root of 51545321 is about 372.1600483895.

Adding to 51545321 its reverse (12354515), we get a palindrome (63899836).

The spelling of 51545321 in words is "fifty-one million, five hundred forty-five thousand, three hundred twenty-one".