51333865 has 16 divisors (see below), whose sum is σ = 67962240. Its totient is φ = 36910720.

The previous prime is 51333853. The next prime is 51333869. The reversal of 51333865 is 56833315.

It is not a de Polignac number, because 51333865 - 2⁵ = 51333833 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51333865.

It is not an unprimeable number, because it can be changed into a prime (51333869) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 349 + ... + 10138.

It is an arithmetic number, because the mean of its divisors is an integer number (4247640).

Almost surely, 2^51333865 is an apocalyptic number.

51333865 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

51333865 is a deficient number, since it is larger than the sum of its proper divisors (16628375).

51333865 is a wasteful number, since it uses less digits than its factorization.

51333865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10592.

The product of its digits is 32400, while the sum is 34.

The square root of 51333865 is about 7164.7655230300. The cubic root of 51333865 is about 371.6504429185.

It can be divided in two parts, 5133 and 3865, that added together give a palindrome (8998).

The spelling of 51333865 in words is "fifty-one million, three hundred thirty-three thousand, eight hundred sixty-five".