51509979433 has 4 divisors (see below), whose sum is σ = 56192704848. Its totient is φ = 46827254020.

The previous prime is 51509979251. The next prime is 51509979463. The reversal of 51509979433 is 33497990515.

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 not a de Polignac number, because 51509979433 - 2⁹ = 51509978921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51509979463) 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, 2341362691 + ... + 2341362712.

It is an arithmetic number, because the mean of its divisors is an integer number (14048176212).

Almost surely, 2^51509979433 is an apocalyptic number.

It is an amenable number.

51509979433 is a deficient number, since it is larger than the sum of its proper divisors (4682725415).

51509979433 is a wasteful number, since it uses less digits than its factorization.

51509979433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4682725414.

The product of its (nonzero) digits is 4592700, while the sum is 55.

The spelling of 51509979433 in words is "fifty-one billion, five hundred nine million, nine hundred seventy-nine thousand, four hundred thirty-three".