51988915 has 16 divisors (see below), whose sum is σ = 68302080. Its totient is φ = 37674720.

The previous prime is 51988913. The next prime is 51988933.

51988915 is nontrivially palindromic in base 10.

51988915 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51988915 - 2¹ = 51988913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51988913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15346 + ... + 18424.

It is an arithmetic number, because the mean of its divisors is an integer number (4268880).

Almost surely, 2^51988915 is an apocalyptic number.

51988915 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

51988915 is a deficient number, since it is larger than the sum of its proper divisors (16313165).

51988915 is a wasteful number, since it uses less digits than its factorization.

51988915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3402.

The product of its digits is 129600, while the sum is 46.

The square root of 51988915 is about 7210.3339035027. Note that the first 3 decimals coincide. The cubic root of 51988915 is about 373.2245914340.

The spelling of 51988915 in words is "fifty-one million, nine hundred eighty-eight thousand, nine hundred fifteen".