51278013049 has 4 divisors (see below), whose sum is σ = 51281112960. Its totient is φ = 51274913140.

The previous prime is 51278013047. The next prime is 51278013077. The reversal of 51278013049 is 94031087215.

51278013049 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 51278013049 - 2¹ = 51278013047 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51278013047) 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, 1525009 + ... + 1558270.

It is an arithmetic number, because the mean of its divisors is an integer number (12820278240).

Almost surely, 2^51278013049 is an apocalyptic number.

It is an amenable number.

51278013049 is a deficient number, since it is larger than the sum of its proper divisors (3099911).

51278013049 is a wasteful number, since it uses less digits than its factorization.

51278013049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3099910.

The product of its (nonzero) digits is 60480, while the sum is 40.

The spelling of 51278013049 in words is "fifty-one billion, two hundred seventy-eight million, thirteen thousand, forty-nine".