51128523 has 16 divisors (see below), whose sum is σ = 76500000. Its totient is φ = 33746400.

The previous prime is 51128513. The next prime is 51128531. The reversal of 51128523 is 32582115.

It is a happy number.

It is not a de Polignac number, because 51128523 - 2⁸ = 51128267 is a prime.

It is a super-2 number, since 2×51128523² = 5228251728323058, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (51128513) 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 15 ways as a sum of consecutive naturals, for example, 6648 + ... + 12101.

It is an arithmetic number, because the mean of its divisors is an integer number (4781250).

Almost surely, 2^51128523 is an apocalyptic number.

51128523 is a deficient number, since it is larger than the sum of its proper divisors (25371477).

51128523 is a wasteful number, since it uses less digits than its factorization.

51128523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18859 (or 18853 counting only the distinct ones).

The product of its digits is 2400, while the sum is 27.

The square root of 51128523 is about 7150.4211764063. The cubic root of 51128523 is about 371.1542309854.

The spelling of 51128523 in words is "fifty-one million, one hundred twenty-eight thousand, five hundred twenty-three".