51147215237 has 4 divisors (see below), whose sum is σ = 51472993836. Its totient is φ = 50821436640.

The previous prime is 51147215219. The next prime is 51147215299. The reversal of 51147215237 is 73251274115.

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 25564492321 + 25582722916 = 159889^2 + 159946^2 .

It is a cyclic number.

It is not a de Polignac number, because 51147215237 - 2⁸ = 51147214981 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51147215237.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51147215437) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 162889064 + ... + 162889377.

It is an arithmetic number, because the mean of its divisors is an integer number (12868248459).

Almost surely, 2^51147215237 is an apocalyptic number.

It is an amenable number.

51147215237 is a deficient number, since it is larger than the sum of its proper divisors (325778599).

51147215237 is a wasteful number, since it uses less digits than its factorization.

51147215237 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325778598.

The product of its digits is 58800, while the sum is 38.

The spelling of 51147215237 in words is "fifty-one billion, one hundred forty-seven million, two hundred fifteen thousand, two hundred thirty-seven".