51765321 has 8 divisors (see below), whose sum is σ = 69058944. Its totient is φ = 34490960.

The previous prime is 51765317. The next prime is 51765353. The reversal of 51765321 is 12356715.

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 51765321 - 2² = 51765317 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51765121) 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 7 ways as a sum of consecutive naturals, for example, 3520 + ... + 10766.

It is an arithmetic number, because the mean of its divisors is an integer number (8632368).

Almost surely, 2^51765321 is an apocalyptic number.

It is an amenable number.

51765321 is a deficient number, since it is larger than the sum of its proper divisors (17293623).

51765321 is a wasteful number, since it uses less digits than its factorization.

51765321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9631.

The product of its digits is 6300, while the sum is 30.

The square root of 51765321 is about 7194.8120892766. The cubic root of 51765321 is about 372.6887675887.

The spelling of 51765321 in words is "fifty-one million, seven hundred sixty-five thousand, three hundred twenty-one".