51821123259 has 8 divisors (see below), whose sum is σ = 69164557312. Its totient is φ = 34512552360.

The previous prime is 51821123251. The next prime is 51821123269. The reversal of 51821123259 is 95232112815.

It is a happy number.

51821123259 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51821123259 - 2³ = 51821123251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51821123251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8712319 + ... + 8718264.

It is an arithmetic number, because the mean of its divisors is an integer number (8645569664).

Almost surely, 2^51821123259 is an apocalyptic number.

51821123259 is a deficient number, since it is larger than the sum of its proper divisors (17343434053).

51821123259 is a wasteful number, since it uses less digits than its factorization.

51821123259 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17431577.

The product of its digits is 43200, while the sum is 39.

The spelling of 51821123259 in words is "fifty-one billion, eight hundred twenty-one million, one hundred twenty-three thousand, two hundred fifty-nine".