51820307289 has 12 divisors (see below), whose sum is σ = 74855108016. Its totient is φ = 34545231672.

The previous prime is 51820307261. The next prime is 51820307311. The reversal of 51820307289 is 98270302815.

It is a happy number.

51820307289 is a `hidden beast` number, since 518 + 20 + 30 + 7 + 2 + 89 = 666.

It is not a de Polignac number, because 51820307289 - 2²¹ = 51818210137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51820307489) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 81874 + ... + 332180.

It is an arithmetic number, because the mean of its divisors is an integer number (6237925668).

Almost surely, 2^51820307289 is an apocalyptic number.

It is an amenable number.

51820307289 is a deficient number, since it is larger than the sum of its proper divisors (23034800727).

51820307289 is a wasteful number, since it uses less digits than its factorization.

51820307289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273316 (or 273313 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The spelling of 51820307289 in words is "fifty-one billion, eight hundred twenty million, three hundred seven thousand, two hundred eighty-nine".