51395385439 has 4 divisors (see below), whose sum is σ = 54418643424. Its totient is φ = 48372127456.

The previous prime is 51395385389. The next prime is 51395385479. The reversal of 51395385439 is 93458359315.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93458359315 = 5 ⋅18691671863.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51395385439 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51395385439.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51395385479) 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, 1511628967 + ... + 1511629000.

It is an arithmetic number, because the mean of its divisors is an integer number (13604660856).

Almost surely, 2^51395385439 is an apocalyptic number.

51395385439 is a deficient number, since it is larger than the sum of its proper divisors (3023257985).

51395385439 is a wasteful number, since it uses less digits than its factorization.

51395385439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3023257984.

The product of its digits is 8748000, while the sum is 55.

The spelling of 51395385439 in words is "fifty-one billion, three hundred ninety-five million, three hundred eighty-five thousand, four hundred thirty-nine".