51798709 has 4 divisors (see below), whose sum is σ = 52015680. Its totient is φ = 51581740.

The previous prime is 51798701. The next prime is 51798713. The reversal of 51798709 is 90789715.

51798709 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, and also an emirpimes, since its reverse is a distinct semiprime: 90789715 = 5 ⋅18157943.

It is a cyclic number.

It is not a de Polignac number, because 51798709 - 2³ = 51798701 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 (51798701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 108127 + ... + 108604.

It is an arithmetic number, because the mean of its divisors is an integer number (13003920).

Almost surely, 2^51798709 is an apocalyptic number.

It is an amenable number.

51798709 is a deficient number, since it is larger than the sum of its proper divisors (216971).

51798709 is a wasteful number, since it uses less digits than its factorization.

51798709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216970.

The product of its (nonzero) digits is 158760, while the sum is 46.

The square root of 51798709 is about 7197.1319982337. The cubic root of 51798709 is about 372.7688769362.

The spelling of 51798709 in words is "fifty-one million, seven hundred ninety-eight thousand, seven hundred nine".