8501221439 has 4 divisors (see below), whose sum is σ = 8541511800. Its totient is φ = 8460931080.

The previous prime is 8501221411. The next prime is 8501221451. The reversal of 8501221439 is 9341221058.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8501221439 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 8501221399 and 8501221408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8501221459) 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, 20144864 + ... + 20145285.

It is an arithmetic number, because the mean of its divisors is an integer number (2135377950).

Almost surely, 2^8501221439 is an apocalyptic number.

8501221439 is a deficient number, since it is larger than the sum of its proper divisors (40290361).

8501221439 is a wasteful number, since it uses less digits than its factorization.

8501221439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40290360.

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 8501221439 is about 92202.0685180110. The cubic root of 8501221439 is about 2040.9253010360.

The spelling of 8501221439 in words is "eight billion, five hundred one million, two hundred twenty-one thousand, four hundred thirty-nine".