51418765 has 4 divisors (see below), whose sum is σ = 61702524. Its totient is φ = 41135008.

The previous prime is 51418751. The next prime is 51418793. The reversal of 51418765 is 56781415.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56781415 = 5 ⋅11356283.

It can be written as a sum of positive squares in 2 ways, for example, as 36348841 + 15069924 = 6029^2 + 3882^2 .

It is a cyclic number.

It is not a de Polignac number, because 51418765 - 2¹⁹ = 50894477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5141872 + ... + 5141881.

It is an arithmetic number, because the mean of its divisors is an integer number (15425631).

Almost surely, 2^51418765 is an apocalyptic number.

It is an amenable number.

51418765 is a deficient number, since it is larger than the sum of its proper divisors (10283759).

51418765 is a wasteful number, since it uses less digits than its factorization.

51418765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10283758.

The product of its digits is 33600, while the sum is 37.

The square root of 51418765 is about 7170.6879028445. The cubic root of 51418765 is about 371.8552183532.

It can be divided in two parts, 5 and 1418765, that added together give a triangular number (1418770 = T₁₆₈₄).

The spelling of 51418765 in words is "fifty-one million, four hundred eighteen thousand, seven hundred sixty-five".