51894440849 has 4 divisors (see below), whose sum is σ = 51894910464. Its totient is φ = 51893971236.

The previous prime is 51894440797. The next prime is 51894440887. The reversal of 51894440849 is 94804449815.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 51894440849 - 2¹² = 51894436753 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51894440794 and 51894440803.

It is not an unprimeable number, because it can be changed into a prime (51894440149) 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, 32024 + ... + 323750.

It is an arithmetic number, because the mean of its divisors is an integer number (12973727616).

Almost surely, 2^51894440849 is an apocalyptic number.

It is an amenable number.

51894440849 is a deficient number, since it is larger than the sum of its proper divisors (469615).

51894440849 is a wasteful number, since it uses less digits than its factorization.

51894440849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 469614.

The product of its (nonzero) digits is 6635520, while the sum is 56.

The spelling of 51894440849 in words is "fifty-one billion, eight hundred ninety-four million, four hundred forty thousand, eight hundred forty-nine".