51308879513 has 4 divisors (see below), whose sum is σ = 51312150708. Its totient is φ = 51305608320.

The previous prime is 51308879491. The next prime is 51308879519. The reversal of 51308879513 is 31597880315.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 44874914569 + 6433964944 = 211837^2 + 80212^2 .

It is a cyclic number.

It is not a de Polignac number, because 51308879513 - 2⁶ = 51308879449 is a prime.

It is a super-2 number, since 2×51308879513² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51308879519) 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, 1611956 + ... + 1643477.

It is an arithmetic number, because the mean of its divisors is an integer number (12828037677).

Almost surely, 2^51308879513 is an apocalyptic number.

It is an amenable number.

51308879513 is a deficient number, since it is larger than the sum of its proper divisors (3271195).

51308879513 is a wasteful number, since it uses less digits than its factorization.

51308879513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3271194.

The product of its (nonzero) digits is 907200, while the sum is 50.

The spelling of 51308879513 in words is "fifty-one billion, three hundred eight million, eight hundred seventy-nine thousand, five hundred thirteen".