51912403849 has 4 divisors (see below), whose sum is σ = 52173270400. Its totient is φ = 51651537300.

The previous prime is 51912403847. The next prime is 51912403853. The reversal of 51912403849 is 94830421915.

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 51912403849 - 2¹ = 51912403847 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51912403799 and 51912403808.

It is not an unprimeable number, because it can be changed into a prime (51912403847) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 130432977 + ... + 130433374.

It is an arithmetic number, because the mean of its divisors is an integer number (13043317600).

Almost surely, 2^51912403849 is an apocalyptic number.

It is an amenable number.

51912403849 is a deficient number, since it is larger than the sum of its proper divisors (260866551).

51912403849 is a wasteful number, since it uses less digits than its factorization.

51912403849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260866550.

The product of its (nonzero) digits is 311040, while the sum is 46.

The spelling of 51912403849 in words is "fifty-one billion, nine hundred twelve million, four hundred three thousand, eight hundred forty-nine".