51849256439 has 4 divisors (see below), whose sum is σ = 51864002424. Its totient is φ = 51834510456.

The previous prime is 51849256411. The next prime is 51849256447. The reversal of 51849256439 is 93465294815.

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

It is a cyclic number.

It is not a de Polignac number, because 51849256439 - 2⁸ = 51849256183 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51849256489) 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, 7367717 + ... + 7374750.

It is an arithmetic number, because the mean of its divisors is an integer number (12966000606).

Almost surely, 2^51849256439 is an apocalyptic number.

51849256439 is a deficient number, since it is larger than the sum of its proper divisors (14745985).

51849256439 is a wasteful number, since it uses less digits than its factorization.

51849256439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14745984.

The product of its digits is 9331200, while the sum is 56.

The spelling of 51849256439 in words is "fifty-one billion, eight hundred forty-nine million, two hundred fifty-six thousand, four hundred thirty-nine".