51807373 has 4 divisors (see below), whose sum is σ = 52282780. Its totient is φ = 51331968.

The previous prime is 51807337. The next prime is 51807397. The reversal of 51807373 is 37370815.

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 46485124 + 5322249 = 6818^2 + 2307^2 .

It is a cyclic number.

It is not a de Polignac number, because 51807373 - 2¹⁷ = 51676301 is a prime.

It is a super-2 number, since 2×51807373² = 5368007794322258, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51807323) by changing a digit.

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, 237540 + ... + 237757.

It is an arithmetic number, because the mean of its divisors is an integer number (13070695).

Almost surely, 2^51807373 is an apocalyptic number.

It is an amenable number.

51807373 is a deficient number, since it is larger than the sum of its proper divisors (475407).

51807373 is a wasteful number, since it uses less digits than its factorization.

51807373 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 475406.

The product of its (nonzero) digits is 17640, while the sum is 34.

The square root of 51807373 is about 7197.7338794929. The cubic root of 51807373 is about 372.7896592398.

The spelling of 51807373 in words is "fifty-one million, eight hundred seven thousand, three hundred seventy-three".