51395789 has 4 divisors (see below), whose sum is σ = 51867420. Its totient is φ = 50924160.

The previous prime is 51395783. The next prime is 51395803. The reversal of 51395789 is 98759315.

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

It can be written as a sum of positive squares in 2 ways, for example, as 37393225 + 14002564 = 6115^2 + 3742^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51395789 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 (51395783) 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, 235652 + ... + 235869.

It is an arithmetic number, because the mean of its divisors is an integer number (12966855).

Almost surely, 2^51395789 is an apocalyptic number.

It is an amenable number.

51395789 is a deficient number, since it is larger than the sum of its proper divisors (471631).

51395789 is a wasteful number, since it uses less digits than its factorization.

51395789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 471630.

The product of its digits is 340200, while the sum is 47.

The square root of 51395789 is about 7169.0856460221. The cubic root of 51395789 is about 371.7998234120.

The spelling of 51395789 in words is "fifty-one million, three hundred ninety-five thousand, seven hundred eighty-nine".