51188528509 has 4 divisors (see below), whose sum is σ = 51250726816. Its totient is φ = 51126330204.

The previous prime is 51188528467. The next prime is 51188528519. The reversal of 51188528509 is 90582588115.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51188528509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51188528519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31097919 + ... + 31099564.

It is an arithmetic number, because the mean of its divisors is an integer number (12812681704).

Almost surely, 2^51188528509 is an apocalyptic number.

It is an amenable number.

51188528509 is a deficient number, since it is larger than the sum of its proper divisors (62198307).

51188528509 is an equidigital number, since it uses as much as digits as its factorization.

51188528509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62198306.

The product of its (nonzero) digits is 1152000, while the sum is 52.

The spelling of 51188528509 in words is "fifty-one billion, one hundred eighty-eight million, five hundred twenty-eight thousand, five hundred nine".