51323865 has 8 divisors (see below), whose sum is σ = 82118208. Its totient is φ = 27372720.

The previous prime is 51323863. The next prime is 51323869. The reversal of 51323865 is 56832315.

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

It is not a de Polignac number, because 51323865 - 2¹ = 51323863 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (51323861) 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, 1710781 + ... + 1710810.

It is an arithmetic number, because the mean of its divisors is an integer number (10264776).

Almost surely, 2^51323865 is an apocalyptic number.

It is an amenable number.

51323865 is a deficient number, since it is larger than the sum of its proper divisors (30794343).

51323865 is a wasteful number, since it uses less digits than its factorization.

51323865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3421599.

The product of its digits is 21600, while the sum is 33.

The square root of 51323865 is about 7164.0676294965. The cubic root of 51323865 is about 371.6263084556.

The spelling of 51323865 in words is "fifty-one million, three hundred twenty-three thousand, eight hundred sixty-five".