51328915 has 16 divisors (see below), whose sum is σ = 67527936. Its totient is φ = 37144800.

The previous prime is 51328913. The next prime is 51328919. The reversal of 51328915 is 51982315.

It is not a de Polignac number, because 51328915 - 2¹ = 51328913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51328913) 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, 9394 + ... + 13816.

It is an arithmetic number, because the mean of its divisors is an integer number (4220496).

Almost surely, 2^51328915 is an apocalyptic number.

51328915 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

51328915 is a deficient number, since it is larger than the sum of its proper divisors (16199021).

51328915 is a wasteful number, since it uses less digits than its factorization.

51328915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4650.

The product of its digits is 10800, while the sum is 34.

The square root of 51328915 is about 7164.4200742279. The cubic root of 51328915 is about 371.6384967511.

The spelling of 51328915 in words is "fifty-one million, three hundred twenty-eight thousand, nine hundred fifteen".