51322220489 has 4 divisors (see below), whose sum is σ = 53091952260. Its totient is φ = 49552488720.

The previous prime is 51322220483. The next prime is 51322220527. The reversal of 51322220489 is 98402222315.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98402222315 = 5 ⋅19680444463.

It can be written as a sum of positive squares in 2 ways, for example, as 20158320400 + 31163900089 = 141980^2 + 176533^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51322220489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51322220483) 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, 884865842 + ... + 884865899.

It is an arithmetic number, because the mean of its divisors is an integer number (13272988065).

Almost surely, 2^51322220489 is an apocalyptic number.

It is an amenable number.

51322220489 is a deficient number, since it is larger than the sum of its proper divisors (1769731771).

51322220489 is a wasteful number, since it uses less digits than its factorization.

51322220489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1769731770.

The product of its (nonzero) digits is 69120, while the sum is 38.

The spelling of 51322220489 in words is "fifty-one billion, three hundred twenty-two million, two hundred twenty thousand, four hundred eighty-nine".