4047122689 has 3 divisors (see below), whose sum is σ = 4047186307. Its totient is φ = 4047059072.

The previous prime is 4047122623. The next prime is 4047122699. The reversal of 4047122689 is 9862217404.

The square root of 4047122689 is 63617.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 2282450625 + 1764672064 = 47775^2 + 42008^2 .

It is not a de Polignac number, because 4047122689 - 2¹³ = 4047114497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4047122609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 31809 + ... + 95425.

Almost surely, 2^4047122689 is an apocalyptic number.

4047122689 is the 63617-th square number.

4047122689 is the 31809-th centered octagonal number.

It is an amenable number.

4047122689 is a deficient number, since it is larger than the sum of its proper divisors (63618).

4047122689 is an frugal number, since it uses more digits than its factorization.

4047122689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127234 (or 63617 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 43.

The cubic root of 4047122689 is about 1593.6102829636.

It can be divided in two parts, 4047 and 122689, that added together give a square (126736 = 356²).

The spelling of 4047122689 in words is "four billion, forty-seven million, one hundred twenty-two thousand, six hundred eighty-nine".