51379765 has 12 divisors (see below), whose sum is σ = 63206532. Its totient is φ = 40094720.

The previous prime is 51379759. The next prime is 51379771. The reversal of 51379765 is 56797315.

It is an interprime number because it is at equal distance from previous prime (51379759) and next prime (51379771).

It can be written as a sum of positive squares in 6 ways, for example, as 16793604 + 34586161 = 4098^2 + 5881^2 .

It is not a de Polignac number, because 51379765 - 2⁵ = 51379733 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 (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5349 + ... + 11461.

It is an arithmetic number, because the mean of its divisors is an integer number (5267211).

Almost surely, 2^51379765 is an apocalyptic number.

It is an amenable number.

51379765 is a deficient number, since it is larger than the sum of its proper divisors (11826767).

51379765 is an equidigital number, since it uses as much as digits as its factorization.

51379765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6200 (or 6159 counting only the distinct ones).

The product of its digits is 198450, while the sum is 43.

The square root of 51379765 is about 7167.9679826294. The cubic root of 51379765 is about 371.7611799113.

The spelling of 51379765 in words is "fifty-one million, three hundred seventy-nine thousand, seven hundred sixty-five".