51308437 has 4 divisors (see below), whose sum is σ = 51399180. Its totient is φ = 51217696.

The previous prime is 51308419. The next prime is 51308447. The reversal of 51308437 is 73480315.

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 30019441 + 21288996 = 5479^2 + 4614^2 .

It is a cyclic number.

It is not a de Polignac number, because 51308437 - 2²³ = 42919829 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51308399 and 51308408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51308447) 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, 44518 + ... + 45655.

It is an arithmetic number, because the mean of its divisors is an integer number (12849795).

Almost surely, 2^51308437 is an apocalyptic number.

It is an amenable number.

51308437 is a deficient number, since it is larger than the sum of its proper divisors (90743).

51308437 is an equidigital number, since it uses as much as digits as its factorization.

51308437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90742.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 51308437 is about 7162.9907859776. The cubic root of 51308437 is about 371.5890676562.

The spelling of 51308437 in words is "fifty-one million, three hundred eight thousand, four hundred thirty-seven".