51230321 has 4 divisors (see below), whose sum is σ = 52882944. Its totient is φ = 49577700.

The previous prime is 51230303. The next prime is 51230323. The reversal of 51230321 is 12303215.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12303215 = 5 ⋅2460643.

It is a cyclic number.

It is not a de Polignac number, because 51230321 - 2¹⁴ = 51213937 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 51230321.

It is not an unprimeable number, because it can be changed into a prime (51230323) 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, 826265 + ... + 826326.

It is an arithmetic number, because the mean of its divisors is an integer number (13220736).

Almost surely, 2^51230321 is an apocalyptic number.

It is an amenable number.

51230321 is a deficient number, since it is larger than the sum of its proper divisors (1652623).

51230321 is a wasteful number, since it uses less digits than its factorization.

51230321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1652622.

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 51230321 is about 7157.5359586942. The cubic root of 51230321 is about 371.4003930652.

Adding to 51230321 its reverse (12303215), we get a palindrome (63533536).

The spelling of 51230321 in words is "fifty-one million, two hundred thirty thousand, three hundred twenty-one".